R.C.G. I certainly am very proud, I know the frustrations that lad has gone through trying to reach the standard he has achieved. Nothing worthwhile ever comes easy.
I’ve watched most of your videos in the last few days and all I can say is thank you! I’ve been playing snooker on and off for 20+ years and yet I’ve learnt so many new things from you. I know I’m already a better player simply because I’m a more knowledgable player. Great stuff, looking forward to the next vid.
This is a special case of the conservation of linear momentum. As the blue hits the red, the part of the blue's velocity that is in the direction of the red's center is transferred entirely to the red. This happens no matter what that velocity is. The bigger the velocity is (I.e the more thick the contact angle or the harder you hit the white), the more velocity will be transferred to the red and it will bounce off faster. But the blue always retains only the velocity in the perpendicular direction (the velocity not transferred to the red). This only works when both balls have the same mass and are round. If the red was lighter than the blue, for instance, some of the blue's momentum in the direction of the line connecting the balls' centers would not be transferred to the red, leaving the blue with some velocity in that direction, which would make it miss the pocket. When the balls don't touch, the line connecting their centers at impact will probably not be exactly perpendicular to the pocket direction. This would mean that the line along which the blue's velocity is cancelled is not the direction perpendicular to the pocket direction, which makes it miss the pocket.
The blue ball wants to follow the path that is tangent to the ball it is touching. Since the red and blue are aligned to the brown spot, that tangent line points directly to the side pocket. When you introduce a tiny gap between the red and blue balls, the tangent line between the red and blue is no longer pointing at the center of pocket, but rather at the balk-side jaw of the pocket. You can still pot the blue by putting a lot of top on the cue ball. The cue ball will impart a little bit of screw on the blue, bringing it back to the pocket. You can also use a lot of top to shoot the frozen balls with pace to accomplish the same results.
Great information. Now I know that when they aren't quite touching, they will react a little differently and consistently and you can plan for that also. Thank you so much for the lessons. I had 2 breaks tonight of 46 and 54. I'm improving every day and you are the main reason for that improvement. Thanks Barry!!
Thank you for your fantastic videos Mr Stark, being a rookie at the sport, your guidance made me notice things I'm doing wrong with my technique, and I've improved vastly over the last year!! Cheers
Elorian. Glad you like the videos and that they have helped you to improve. Its amazing really, improvement sort of creeps up on you, first you are surprised when a ball goes in, then you are surprised when it doesn't. Good luck with your progress.
The reason why the shot works is pretty simple in terms of physics, but a bit hard to explain simply. When the cue ball strikes the blue, a portion of it's energy is transmitted to the blue. And because the blue is touching the red, a portion of that energy is immediately transferred to the red, causing the red to move down the table. With "perfect" balls, there would be complete transfer of energy through the blue to the red, meaning that blue's only motion would be perfectly perpendicular to the red, meaning it would be impossible to miss. The reason why this shot is miss-able is because the balls are not perfect. A perfect ball would be 100% elastic, meaning that all of it's energy is transferred to another ball when hit straight--ideally the first ball stops dead, and the second ball absorbs all the energy. It's like a "Newton's Cradle"; it's the same principle of energy transfer. Because the balls are not perfect, the blue will slightly follow the red as it is moving perpendicular to the red. It shouldn't do this, but it does in the real world. This results in the blue moving off at a slight angle, angled toward the direction the red travels in. This deviation is present all the time. What is interesting about this example is that as the blue is struck harder, this deviation becomes more pronounced. This seems to indicate that the balls behave less and less perfectly as they are struck harder. So this really is a special case that shows the imperfection of the balls themselves, because it eliminates any error that could come from cuing. We are simply witnessing the physics of the balls themselves without the complication of the player's accuracy and judgement.
Why would the blue follow the red? It doesn't have any space to develop rotation (since it's touching the red). If it does indeed develop rotation, then the harder you hit it the less effect it will have (since it has less time on the cloth to grip it and follow forward).
Dragos Puri: To say "follow" probably isn't the perfect word for me to use. In the same scenario with rubber balls, the phenomenon of the blue missing would be much more obvious, because the balls change shape on impact, which absorbs energy and then releases it. It is this absorbing and releasing of energy that makes the blue slightly "follow" the red, rather than going straight into the pocket. And the more energy put into the balls, the more pronounced this phenomenon becomes.
+fredy gump, I think the explanation may be something else, cause the balls are virtually 100% elastic, as they return 100% to their original shape. And if you watch break off shots in pool, in super slow motion, you see that the deformation of the ball is not visible, so it must be way less than a millimeter of diameter. and that wouldn't be enough to make you miss the pot.
dang barry you must be proud.... he really was a warrior in the final. and the emotion shows how much passion he has for the sport. he has gained a new fan. :-)
It's sort of a reverse plant, you never really take notice of where the intermediate ball goes, but it's a very useful tool, and one I have started looking for as much as the plant shots! Great tip Barry!
So the basic tangent line shot relies on no loss of energy due to elastic compression between the balls, which will be true for a soft to medium shot weight. When the cue ball strikes an object ball hard the two balls compress and momentarily "glue" together. For that moment the balls travel together along a common path until they rebound. The overall result will be slightly reduced recoil angles for the cue and object balls and an increased recoil angle on the third ball. If you are cutting the object ball to the right then the third ball will also go to the right. The effect can be used to sink either the object ball or the third ball when they are slightly off the tangent line or "not potable". The physics is described by balancing elastic effects with apparent/relative conservation of momentum and conservation of energy, but is rather complex due to ball spin, cloth friction etc.Interestingly, when the object and third ball are close, but not touching, the object ball behaves as you would expect, but the object and third ball "glue" together momentarily (because the object ball will not have developed spin yet) and the third ball reacts just as above, i.e. drifts in the same direction as you cut the object ball.
I might understand the concept, but I really wish I could reliably make use of it instead of miscuing, accidentally jumping the cue ball, or consistently miss-aiming!
Energy and momentum have to be conserved. This is just an extension of the right angle rule but because of the additional ball in the system the blue has to counter the energy and momentum of the cue ball going off in the other direction after it leaves the blue. The blue has to travel at a right angle to the red as normal.
And the more forward-thrusting force you give to a ball against a leaning red, the less effective the physical absorption will be for the red or any ball that "acts as a rail" - a bit like a skinny, unfit person punching a brick wall versus a muscular boxer punching a brick wall.
hi coach i remember this right angle touching ball position was called a set. when you hit the blue ball half-ball, it will roll off at an angle, say the blue ball then hits the red ball 2" away, that might be another half-ball contact, the blue ball will end up say 2, 3 ft down from the center pocket. now reduce the red/blue distance incrementally, the blue ball will reach the cushion closer and closer to the center pocket.
It's known as the 90 degree rule. The portion of cue balls original momentum is transferred into the red ball in the direction of the line between the centre of the two balls at the point of impact.
I'm not good in physics but here is my version. When you make a common gentle shot (not too hard and not too week) with center ball striking through the comfortable distance, cue ball is reflecting in 90 degrees angle from the potting line and for common shots that is a natural reflection. In this situation the potting line of a blue ball creates 90 degrees angle to the line red and blue balls are creating. So blue ball is reflecting from the red the same way as cue ball would do. When blue and red are not touching and you hit it from the left side, blue hits red ball in a slightly different point, it still reflects in 90 degrees, but the line where blue and red balls get in touch is not parallel to the cushion any more i.e. blue ball hits red ball slightly thinner, that's why it goes wide and hits the far jaw.
When three balls are in contact simultaneously, the usual simple rules of perpendicular separation no longer work. In order to find the paths of the three balls after the collision -- the struck object ball, the far object ball and the cue ball, you have to do a fairly complex calculation that takes into account the forces between the balls as a function of how much the balls are compressed together. (Technically, this is called a "three body problem" in physics.) The situation shown and several other frozen ball situations are discussed in Robert Byrne's books on pool and billiards. In fact there is a system to calculate how much the ball struck will be "forced through" the second object ball. It is called the "ten times fuller" system. This can be used to adjust touching balls that are not lined up quite correctly. In other situations where there are additional balls behind the two, it is possible to make the first object ball go in the other direction as if it is pushed back off the several balls. Making the situation more complicated is the fact that top and bottom spin on the cue ball can be transferred to the object ball as bottom and top. That can also change the path of the struck ball.
Thanks and exactly what my mind jumped to--trying to sort out how side or screw might be used to compensate for imperfect alignments as shall happen in play.
Apologies if someone else got this but it's quite simple at low speed i.e. just enough for the blue to reach the side pocket, the cue ball does not impart enough energy for the blue to overcome the inertia of the red ball before being squeezed out to the right, more pace on the white imparts enough energy for some of the red balls inertia to be overcome thereby letting the blue move forward before being squeezed to the right and missing the pocket to the left, more energy the more inertia overcome.
So this is what happens when you play a shot harder using the rebound effect! If you play a shot a medium pace ,the object ball doesn't and will not have too many revolutions.hence it still goes into the pocket. But when same shot is played harder,two things happen, 1.the ball will develop some side and deviate to towards the right of the pocket. 2. (This happens because of newtons 3rd law of motion) the red ball forces the blue ball towards the black rail.
When you play a stun shot, where the cue ball has zero top or back spin at the moment it contacts the object ball, it comes off the object ball at 90 degrees to the direction of travel of the object ball. All that is happening here is that the blue has no top or back spin when it contacts the red, so it comes off at 90 degrees. You are essentially stunning the blue into the red. No need to call it "rebound effect" its just stun.
Why and how this works is actually quite similar to how Newton's cradle works and why the middle balls don't move, only the outermost do. Potting a plant follows the same principle actually, but if the balls are perfectly aligned with the show the one that you hit won't move at all. Here they are not aligned, so the blue ball transfers its "motion" along one axis to the red ball (so it loses its momentum along that axis) and follows a perpendicular path along the other axis and goes straight into the pocket (that's the part of its momentum it doesn't lose). Why it won't work when there's a gap is because three things are happening then: 1. axes along which both bals would normally travel are shifted down the table a bit 2. they are also a bit twisted/rotated, because the point of contact is also different (the blue ball has some space to move, so it hits the red one on a different spot) 3. the blue ball has some time to develop a forward roll which introduces angular movement and moment of inertia (blue ball's rotation won't stop instantaneously when it hits the red, it'll "want" to travel a bit further down the table, because it's rolling in that direction) So that's pretty much how it works :)
I’m not a physicist but the first thing that comes to mind is the combined weight of the two balls. When you put the cue ball in motion you increase its mass therefore as long as you don’t increase the mass more than the combined mass of the two OBs the shot should work.
Hi Barry, I'll take a shot. 1. Balls touching, easy shot: Ball A that's hit gets forward momentum, but can't move there because of ball B. Also, because you don't hit it straight on, it gets some sideward momentum. So it has to move, but where? Ball A is in a squeeze between the cue ball and ball B. Ball A going backward is unimaginable, and going forward is not possible because of ball B. So going right angle is the only compromise it can take between two impossibilities. 2. Balls touching, strong shot: A fast cue ball hitting harder moves the whole three-ball constellation slightly forward before ball A can leave it. So the squeeze-out happens later. Also, a cogwheel effect should be considered, i.e. when the cue ball hits harder, A rotates B counter-clockwise a little bit more than on an easy shot before the balls part. 3. Balls just not touching: I assume ball A hits ball B not dead center, but slightly to the right. If I'm not wrong, at 04:54 you can see that ball B went slightly left, as opposed to the first shot where ball B went to the right.
i think it would be much easier to understand what's actually happening if we would considered the blue ball as a ghost ball (but without removing it) and the actual direction of the shot is on the line that is formed when the cue ball and the blue ball touch. i also noticed that the red ball is always going perpendicularly to the path of the blue which is the natural angle of this shot.
Long time fan Barry. I think I may have the answer you're looking for. Imagine that in your first example the blue was the cue ball and the red was the object ball, at that instant in time where they are making contact. The force provided by your actual cue ball gave your blue 'cue' ball the energy and direction with which it struck the red, and the result is that you sent the red down the line of the table and sunk the blue 'cue' on the in off. In fact every shot where you demonstrated this technique, you'd been sinking the ball which was acting as if it was the cue ball. I hope this makes sense - the red is the object, the coloured ball is the 'cue', the actual cue ball is, for want of a better analogy, the cue. The fact that the balls have to touch for this to work is the clue, the physics is the same as what you'd get if the blue ball wasn't there and you'd struck the red full on the face with the cue ball, sending the red down the table and the white into the pocket.
You're right Barry, numerous forces at "play". As with other reactions the more reds you put touching each other and the blue the harder you can hit as they fight the force of the direction of the shot, they may also increase the " bounce" effect though. Please post your results. Great education Good luck Kyren
Blue ball has kinetic energy that could be split into parallel and perpendicular vectors. Since contact area between balls is a point, and contact time is very short - blue ball being constrained from the back by red ball can only get perpendicular energy, while red ball being contacted on the perfectly parallel point can only acquire parallel energy vector. Because balls are touching, the red ball gets full parallel energy, just like in Newton's cradle. This is perfect situation, for perfect balls and no spin obviously.
Hello M. Stark. During a match yesterday, I potted a black and played for a red just below the pink spot. The problem is that I cannoned another red and the cue ball stopped about a 1/4 inch from the intented red. Now, I could have played straight to the center pocket but decided to play safe to avoid doing a push shot. So my question is this : in this kind of situation, is there a way to make a ball travel a reasonnable distance by hitting it full in the face when you are very close to it without doing a push shot? Thank you for all your videos! Eric, Quebec City.
Musique. 1/4 inch is awfully close and avoiding a push shot is difficult. The only way it could be done is to raise the cue butt almost vertical so that you are striking down on the cue ball. Getting any substantial movement on the object ball will still be tricky and certainly a degree of accuracy will be lost.
That's what I thought. Since the cue ball was near the pink spot, it would have been difficult to get enough elevation on the cue. I guess I made the right decision by playing safe.Too tricky for me!! Thanks a lot, M. Stark.
It is only my opinion. First, the three balls are of similar weight and dimension. The good point is the pace of the cue ball. Snooker balls work within collision theory taking into account of the similar masses of the balls . When the blue ball was hit with a lighter pace, the momentum of the cue ball was relatively similar to the combined weight of the two balls itself. So, when the cue ball hits from a tangential side of the blue ball, the incoming momentum of the cue ball impart a force to the blue ball which is directly in touch with the red ball. The blue originally had to move in the imparted direction of the cue ball. However, being blocked by the similar weight displaces the direction of the motion to the minimum possible resultant path. Due to which the blue ball behaved perpendicular to the red ball. The red ball behaved on the straight line because the transfer of the momentum happened exactly at the center of gravity as it was touching the blue ball. Thus, when the cue ball was hit with a greater pace, the momentum was bigger enough to move the two balls in contact before transferring the momentum. So, the resultant path was deviant from the perfect collision path. If the blue ball would have been hit thicker around the center of the blue ball, the impact would have resulted in stopping the blue ball and transferring all the momentum to the red ball. When we looked closer, the red ball path would also be deviant when the two balls were hit with a greater pace. It is also important to take the direction of the impacting momentum of the cue ball. If the cue ball would have been hit from a more acute angle closer to the center pocket, the path of the blue ball would behave differently. Now, when the blue ball and red ball were apart, there was a loss of energy and a part of the momentum displacement had already taken effect before the blue ball hitting the inertial red ball. So, the blue ball was actually having a momentum a fraction of seconds before hitting the red ball thus making the deviated displacement.
I got a question. When down on a shot feathering, or even hitting the ball, i understand that the cue should be close to the body. What if it's held against the body to help guide it in a straight line? Should it be better this way? If not, then why not? Would aprreciate some opinion from you guys. Thank you.
Chow. Most modern players play with the cue against the body, ( see the shine on their waistcoat) if you do not support the cue with the body it demands so much from your technique and it is very difficult to be consistent.
hello barry stark... i had a simple question to be cleared about... does the pink in the start of the frame pots to the corner pocket... i mean while setting the frame... pls clear... thanks
sanjay. At the start of the frame the apex red should be positioned as close to the pink ball as possible without touching it. This will then mean that the pink ball cannot be potted directly into either corner pocket.
Mr stark, I have been playing for a few months now and have developed a rudimentary pre shot routine and cue action. Recently I have heard of people imitating tv professional players pre shot routines and cueing action to there benefit and improvement, is this worth doing to start off and build on that or should I work on creating my own unique style and routine?
Ciaran. It is always a good idea to emulate good players up to a point even though ultimately you are an individual and your own playing style should be allowed to emerge. I always used to admire the cue action of John Parrot, it was level, methodical and yet very simple, ideal for a beginner to copy. Please look him up on RUclips.
The tangent line which is 90 degrees from contact of the ball. this can happen all over the table given that the tangent line leads straight to the pocket from the ball where it must contact leads straight to your target. You can use this in many other ideas such as instead of the object ball carom off of another ball. you can use the cue ball and easily figure out the exact direction it will travel off of the object ball. This tangent line is effected by spins as well, so if you hit the cue ball in a way where it will be sliding by the time it contacts the object ball it will travel the tangent line. However if the cue ball is rolling or if you add top spin to the shot the tangent line will be pushed forward, verses if the ball is spinning backwards by contact the tangent line will be pulled back. A lot of us American pool players use this knowledge to our advantage considering the amount of cue ball control that is necessary in our cue sports. I believe that with the harder shot taken on the blue was thrown consider the possibility that perhaps the amount of power you delivered could have been the necessary amount to produce side spin onto the blue which may have had a throw effect on it. This has sparked my curiosity though I will try this out when I'm at the pool tournament today on a practice table and try using a striped ball to see if there is any side spin on it. I will let ya know what I find out.
Hi Barry I've been watching your videos for years now and I'm so grateful.. but I have a problem with fidgeting my elbow and wrist around not so much the wrist anymore but seems to be my elbow a lot more.. I've tried what seems like everything and still am.. sometimes it's good other times not or during a high break it seems to wobble around.. I've heard pulling your shoulder or anything with tension involved is bad so I don't know how to solve this..please help?
Kinhu. You are right about tension, it is bad in any area and will adversely affect your game. Providing you are taking up something like a natural position and there is no physical abnormality the elbow should fall into the reasonable limits of a recognised position. Study my video on the grip, concentrating on the front of the hand and then it is just practise to groove that cue action.
It probably has to do with a double-kiss when the blue comes off that red. Struck thickly and at pace, the white may ever so slightly give the blue a second contact, throwing it off line. It would follow that this shot should work with the blue struck quite thinly and at pace; I have yet to test this hypothesis.
klieu. Don't think a double kiss takes place, there are some very good answers below. I am always in favour of lively discussion but respecting the other persons point of view.
Hey barry , so after i reached 58 break with the club cue , i was using a kamui 1.21 from my pool cue , do i really need a cue or its the same with the club cue , what is the difference between them , i know the difference between pool cues and i have pure x hxt 65 and pure x jumb break but is it the same for snooker ?
mr. I am sorry but I do not play pool, American or the English version. The figures you quote are unfamiliar to me but I assume you are talking about American pool where you have a more robust cue for breaking off. The tolerances at snooker are much finer and we only play with one cue, this is usually a lot thinner than the standard pool cue because the balls are smaller and lighter. Some snooker players play with Kamui tips on their snooker cue and the preferred size is between 9mm and 10mm in diameter.
Hi Barry, I came across a video showing Efren Rayes teaching a guy to do a similar shot with extreme draw shot and it altered the path of object ball significantly. Maybe apart from the speed of shot, type of shot may have effect too. Here is the link for reference and discussion. ruclips.net/video/beHrUWPfXe0/видео.html
I am a Theoretical Physics student at Queen’s University Belfast And this happens because, since the balls are touching, they are considered one mass. When the cue ball strikes the “one mass” the blue and red ball move with the of the velocity of the cue ball but perpendicular to each other , so momentum is conserved. When the velocity of the cue ball is slow the component of the blue ball (in the direction of the red ball) is small so the deviation is less, however when the velocity is greater this same component is much larger therefore the resultant velocity has a greater angle i.e greater deviation. This only works when the two balls are touching because of the “one mass” and momentum must be conserved. If not they will not move perpendicular to each other.
You have to calculate the angle,your explanation is good but the mass doesnot exactly carry the velocity of cue ball,you to calculate how much it carries through the conservation of momentum....
legoir juama that would only apply with linear momentum but the two balls have velocities in different vector planes. If you made it linear, cos(90) = 0 so has no effect on the i vector (red ball direction) and vice versa. However, this is not an elastic collision, so the balls wont have the same as the cue ball but this is not because of conservation of momentum
Adrian Mc Cay exactly it is not an elastic collison so you cannot expect the joint mass to have the velocity that cue ball had,and also the mass is twice as heavy than the cue ball (since balls are touching and behave as one unit with twice the mass) , and also you can model this system as nearly elastic collision and the linear and angular momentum conservation principle holds good.
I imagine the harder shot has enough energy to force it beyond the obstacle slightly. Or it causes more friction between the object balls creating ball rotation. Or because the ball is fast enough to touch the rebounding red twice. No idea really!
Ah right, I felt like I'd heard your voice before, and it came to me - Stoke City's commentator Nigel Johnson, very similar to my ear anyway. Thanks for the reply, great channel.
Mustafa. Both players agreed that the frame was going nowhere so asked the referee if they could have a re- rack. The only other option was for them to keep rolling up, hardly inspiring snooker.
I get it and it’s simpele. Bouncing of right away, makes the ball go into the pocket. But if the objectball first takes over the speed of the white for a certain distance, you will get a result angle, and the objectball will not pot.
Hi sir stark. I would say that this is a simple plant. I don't think that rebound is appropriate for it. I learned this "trick" about 10 years ago. If you place the balls slightly apart, your object ball is going to hit the other ball at a different angle, hence the different trajectory. But... but... i don't really understand why it travels differently when hit harder. Anyway, you can place it a more acute angle (something like an impossible angle when trying to pot blue ball without the other ball into the middle pocket) and it still works. Try it. Haha. Cheers.
Blue pots due to 90 degree angle rule... When two balls strike with each other they always leave at 90 degree angle.. .. Blue pots when toching becoz 90 degree is directly towards pocket.... When blue and red are not touching the 90 degree between red and blue (when they contact each other) is not towards pocket... Thats why blue moves towrds jaw when blue and red not touchng...
I tried my best to explain using an image: imgur.com/a/exemM First of all, this can be wrong.. it is my personal thoughts. After contact the white exerts an extra small force cause by the elastic deformation being reverted, which causes the blue ball to drift to the left. The harder the short, the farther the blue will get deflected. This can be further investigated, I believe the geometric non-linearity of the deformation causes this issue, which is an advanced topic in material science. A slow motion study can also clarify and answer a lot of questions. I am no expert in this, I hope I didn't throw a fatal mistake :D
Does the angle at which the blue is hit has s role it seems that that the direction of the force is important here as if only energy transfer imbalance was the only determinant a blue ball hit fully in the face should go to the side pocket. So more like 2 vectors here and is more pronounced as the stroke force increases. No physics just logic.
Yasser. As long as the blue is hit off centre it goes towards the side pocket, obviously some experimentation is needed to determine the exact line because conditions influence it slightly but the principle remains.
timtranslates. It is fairly common for a professional to attempt to play one ball off another, but for the balls to land in such a position that the shot cannot be missed is obviously quite rare.
Rocky. I have no need to answer this, the lads below have answered it for me. I will only add do not try to run before you can walk. Start easy and close progressing to hard and further away.
Hi Barry, good coaching channel, here is your answer as to why: When you play softly(like in your example), the blue ball gets a very tiny right spin from friction between blue and red. Shooting harder, there is no friction, the balls just slide off each other. Now back to you: Doesn't the nap of the cloth play a factor as well? I believe so.
Hi Barry, Have a wee watch of this video featuring Stephen Hendry, some Snooker physics. ruclips.net/video/muIxj-bR4FI/видео.html It explains the 90 degree rule. What is happening, is the white ball is going off 90 degrees from the blue ball and the blue ball will also always go 90 degrees from its contact with the red. Although the white will not look as though its going 90 degrees because the blue instantly hits the red and changes its direction to 90 degrees from the red. This is still happening even with the gap between them, the blue and red will go off each other in 90 degrees its just that the initial contact is not at the right angle to send the blue into the pocket. You can see this in your video, the blue still goes 90 degrees, just that the inch or two it moves first is putting the 90 degrees above the pocket. This principle could be useful for figuring out if you're going in off a pot.
Watch a liv boeree and Stephen hendry vid she is incredible smart and a science genius and she goes into depth about the equations of the 90’ angle in snooker which happens in every shot nearly. Plz take time out to watch but be warned she’s smart and extremely beautiful. The perfect woman. Just type Stephen hendry liv boeree thanks Barry 👍👍👍🏴🏴🏴 It’s actually the pyjsics of snooker with SH and LB. enjoy lol
What a performance from Kyren today! You must be very proud 👏
R.C.G. I certainly am very proud, I know the frustrations that lad has gone through trying to reach the standard he has achieved. Nothing worthwhile ever comes easy.
I’ve watched most of your videos in the last few days and all I can say is thank you! I’ve been playing snooker on and off for 20+ years and yet I’ve learnt so many new things from you.
I know I’m already a better player simply because I’m a more knowledgable player. Great stuff, looking forward to the next vid.
sweat. Glad you like the videos.
This is a special case of the conservation of linear momentum.
As the blue hits the red, the part of the blue's velocity that is in the direction of the red's center is transferred entirely to the red. This happens no matter what that velocity is. The bigger the velocity is (I.e the more thick the contact angle or the harder you hit the white), the more velocity will be transferred to the red and it will bounce off faster. But the blue always retains only the velocity in the perpendicular direction (the velocity not transferred to the red).
This only works when both balls have the same mass and are round. If the red was lighter than the blue, for instance, some of the blue's momentum in the direction of the line connecting the balls' centers would not be transferred to the red, leaving the blue with some velocity in that direction, which would make it miss the pocket.
When the balls don't touch, the line connecting their centers at impact will probably not be exactly perpendicular to the pocket direction. This would mean that the line along which the blue's velocity is cancelled is not the direction perpendicular to the pocket direction, which makes it miss the pocket.
Doron. Sorry for late reply, I have been on holiday. You have given a lot of food for thought.
The blue ball wants to follow the path that is tangent to the ball it is touching. Since the red and blue are aligned to the brown spot, that tangent line points directly to the side pocket.
When you introduce a tiny gap between the red and blue balls, the tangent line between the red and blue is no longer pointing at the center of pocket, but rather at the balk-side jaw of the pocket. You can still pot the blue by putting a lot of top on the cue ball. The cue ball will impart a little bit of screw on the blue, bringing it back to the pocket. You can also use a lot of top to shoot the frozen balls with pace to accomplish the same results.
bushputz. Thanks very interesting.
Great information. Now I know that when they aren't quite touching, they will react a little differently and consistently and you can plan for that also. Thank you so much for the lessons. I had 2 breaks tonight of 46 and 54. I'm improving every day and you are the main reason for that improvement. Thanks Barry!!
Alan. Well done, keep it up.
Great cameo from Barry on BBC giving Kyren a new waistcoat
Thank you for your fantastic videos Mr Stark, being a rookie at the sport, your guidance made me notice things I'm doing wrong with my technique, and I've improved vastly over the last year!! Cheers
Elorian. Glad you like the videos and that they have helped you to improve. Its amazing really, improvement sort of creeps up on you, first you are surprised when a ball goes in, then you are surprised when it doesn't. Good luck with your progress.
The reason why the shot works is pretty simple in terms of physics, but a bit hard to explain simply.
When the cue ball strikes the blue, a portion of it's energy is transmitted to the blue. And because the blue is touching the red, a portion of that energy is immediately transferred to the red, causing the red to move down the table.
With "perfect" balls, there would be complete transfer of energy through the blue to the red, meaning that blue's only motion would be perfectly perpendicular to the red, meaning it would be impossible to miss.
The reason why this shot is miss-able is because the balls are not perfect. A perfect ball would be 100% elastic, meaning that all of it's energy is transferred to another ball when hit straight--ideally the first ball stops dead, and the second ball absorbs all the energy. It's like a "Newton's Cradle"; it's the same principle of energy transfer.
Because the balls are not perfect, the blue will slightly follow the red as it is moving perpendicular to the red. It shouldn't do this, but it does in the real world. This results in the blue moving off at a slight angle, angled toward the direction the red travels in. This deviation is present all the time.
What is interesting about this example is that as the blue is struck harder, this deviation becomes more pronounced. This seems to indicate that the balls behave less and less perfectly as they are struck harder. So this really is a special case that shows the imperfection of the balls themselves, because it eliminates any error that could come from cuing. We are simply witnessing the physics of the balls themselves without the complication of the player's accuracy and judgement.
finally a correct explanation
Why would the blue follow the red? It doesn't have any space to develop rotation (since it's touching the red). If it does indeed develop rotation, then the harder you hit it the less effect it will have (since it has less time on the cloth to grip it and follow forward).
Dragos Puri: To say "follow" probably isn't the perfect word for me to use. In the same scenario with rubber balls, the phenomenon of the blue missing would be much more obvious, because the balls change shape on impact, which absorbs energy and then releases it. It is this absorbing and releasing of energy that makes the blue slightly "follow" the red, rather than going straight into the pocket. And the more energy put into the balls, the more pronounced this phenomenon becomes.
+fredy gump, I think the explanation may be something else, cause the balls are virtually 100% elastic, as they return 100% to their original shape. And if you watch break off shots in pool, in super slow motion, you see that the deformation of the ball is not visible, so it must be way less than a millimeter of diameter. and that wouldn't be enough to make you miss the pot.
fredy. Very interesting, many thanks.
dang barry you must be proud.... he really was a warrior in the final. and the emotion shows how much passion he has for the sport. he has gained a new fan. :-)
thedocak. Thanks, I am very proud, the occasion got to him in the end hence the tears.
It's sort of a reverse plant, you never really take notice of where the intermediate ball goes, but it's a very useful tool, and one I have started looking for as much as the plant shots! Great tip Barry!
Steve. Its always handy to make a mental note of anything unusual happening and experiment later.
So the basic tangent line shot relies on no loss of energy due to elastic compression between the balls, which will be true for a soft to medium shot weight. When the cue ball strikes an object ball hard the two balls compress and momentarily "glue" together. For that moment the balls travel together along a common path until they rebound. The overall result will be slightly reduced recoil angles for the cue and object balls and an increased recoil angle on the third ball. If you are cutting the object ball to the right then the third ball will also go to the right.
The effect can be used to sink either the object ball or the third ball when they are slightly off the tangent line or "not potable". The physics is described by balancing elastic effects with apparent/relative conservation of momentum and conservation of energy, but is rather complex due to ball spin, cloth friction etc.Interestingly, when the object and third ball are close, but not touching, the object ball behaves as you would expect, but the object and third ball "glue" together momentarily (because the object ball will not have developed spin yet) and the third ball reacts just as above, i.e. drifts in the same direction as you cut the object ball.
GDA. Thanks for the answer, there have been some very good comments about the subject, its good to have debate.
I might understand the concept, but I really wish I could reliably make use of it instead of miscuing, accidentally jumping the cue ball, or consistently miss-aiming!
Energy and momentum have to be conserved. This is just an extension of the right angle rule but because of the additional ball in the system the blue has to counter the energy and momentum of the cue ball going off in the other direction after it leaves the blue. The blue has to travel at a right angle to the red as normal.
Saw you at the ally pally, kyren was unlucky but its amazing to see such potential and how far youve taken him. Definitely not his last final.
Gabriel. I hope you are right about the finals, he certainly works hard enough.
It happens because blue is coming off the tangent line; the red is acting as a rail.
And the more forward-thrusting force you give to a ball against a leaning red, the less effective the physical absorption will be for the red or any ball that "acts as a rail" - a bit like a skinny, unfit person punching a brick wall versus a muscular boxer punching a brick wall.
99 critical shots in pool book have great examples of these kind of shots Good read and may explain.
Keep up your great work Barry ...
Charles. Thank you for the information.
Good luck to the "warrior" .. Will be rooting for him all the way from Abu Dhabi.. must be a proud moment for you as a coach.. good luck.
Phillip. Thanks for the well wishes, unfortunately he didn't have quite enough in the final.
hi coach i remember this right angle touching ball position was called a set. when you hit the blue ball half-ball, it will roll off at an angle, say the blue ball then hits the red ball 2" away, that might be another half-ball contact, the blue ball will end up say 2, 3 ft down from the center pocket. now reduce the red/blue distance incrementally, the blue ball will reach the cushion closer and closer to the center pocket.
jhaga. Well said with understanding.
It's known as the 90 degree rule. The portion of cue balls original momentum is transferred into the red ball in the direction of the line between the centre of the two balls at the point of impact.
I'm not good in physics but here is my version. When you make a common gentle shot (not too hard and not too week) with center ball striking through the comfortable distance, cue ball is reflecting in 90 degrees angle from the potting line and for common shots that is a natural reflection. In this situation the potting line of a blue ball creates 90 degrees angle to the line red and blue balls are creating. So blue ball is reflecting from the red the same way as cue ball would do. When blue and red are not touching and you hit it from the left side, blue hits red ball in a slightly different point, it still reflects in 90 degrees, but the line where blue and red balls get in touch is not parallel to the cushion any more i.e. blue ball hits red ball slightly thinner, that's why it goes wide and hits the far jaw.
DonST. You have used logic and common sense, well done.
When three balls are in contact simultaneously, the usual simple rules of perpendicular separation no longer work. In order to find the paths of the three balls after the collision -- the struck object ball, the far object ball and the cue ball, you have to do a fairly complex calculation that takes into account the forces between the balls as a function of how much the balls are compressed together. (Technically, this is called a "three body problem" in physics.)
The situation shown and several other frozen ball situations are discussed in Robert Byrne's books on pool and billiards.
In fact there is a system to calculate how much the ball struck will be "forced through" the second object ball. It is called the "ten times fuller" system. This can be used to adjust touching balls that are not lined up quite correctly. In other situations where there are additional balls behind the two, it is possible to make the first object ball go in the other direction as if it is pushed back off the several balls.
Making the situation more complicated is the fact that top and bottom spin on the cue ball can be transferred to the object ball as bottom and top. That can also change the path of the struck ball.
Bob. Very interesting, many thanks.
Thanks and exactly what my mind jumped to--trying to sort out how side or screw might be used to compensate for imperfect alignments as shall happen in play.
Sir please tell me how to make long ball screw back
Rocky Sharma it's about timing and not hitting the ball hard plus keep your cue parallel with the table
Timing practice practice practice practice practice and feel and timin
What timing
The way you deliver the cue through the cueball it's all about timing and also practice
Hayden Rosan it does require a bit of pace, or else it will just come back like a inch or so..
Another great video.
All the best to you and Kyren at the Masters.
Steve. Many thanks for the well wishes and I am pleased you like the videos.
What a match from Kyren, congratulations to you sir!
Allen. Many thanks, he did rather well didn't he.
Apologies if someone else got this but it's quite simple at low speed i.e. just enough for the blue to reach the side pocket, the cue ball does not impart enough energy for the blue to overcome the inertia of the red ball before being squeezed out to the right, more pace on the white imparts enough energy for some of the red balls inertia to be overcome thereby letting the blue move forward before being squeezed to the right and missing the pocket to the left, more energy the more inertia overcome.
Ian. Sounds good to me.
So this is what happens when you play a shot harder using the rebound effect! If you play a shot a medium pace ,the object ball doesn't and will not have too many revolutions.hence it still goes into the pocket. But when same shot is played harder,two things happen, 1.the ball will develop some side and deviate to towards the right of the pocket. 2. (This happens because of newtons 3rd law of motion) the red ball forces the blue ball towards the black rail.
Cavan. Worth reading what others have had to say below.
When you play a stun shot, where the cue ball has zero top or back spin at the moment it contacts the object ball, it comes off the object ball at 90 degrees to the direction of travel of the object ball. All that is happening here is that the blue has no top or back spin when it contacts the red, so it comes off at 90 degrees. You are essentially stunning the blue into the red. No need to call it "rebound effect" its just stun.
Why and how this works is actually quite similar to how Newton's cradle works and why the middle balls don't move, only the outermost do. Potting a plant follows the same principle actually, but if the balls are perfectly aligned with the show the one that you hit won't move at all. Here they are not aligned, so the blue ball transfers its "motion" along one axis to the red ball (so it loses its momentum along that axis) and follows a perpendicular path along the other axis and goes straight into the pocket (that's the part of its momentum it doesn't lose).
Why it won't work when there's a gap is because three things are happening then:
1. axes along which both bals would normally travel are shifted down the table a bit
2. they are also a bit twisted/rotated, because the point of contact is also different (the blue ball has some space to move, so it hits the red one on a different spot)
3. the blue ball has some time to develop a forward roll which introduces angular movement and moment of inertia (blue ball's rotation won't stop instantaneously when it hits the red, it'll "want" to travel a bit further down the table, because it's rolling in that direction)
So that's pretty much how it works :)
Lukasz. That simplifies the physics of it all. There have been some very good explanations.
I’m not a physicist but the first thing that comes to mind is the combined weight of the two balls. When you put the cue ball in motion you increase its mass therefore as long as you don’t increase the mass more than the combined mass of the two OBs the shot should work.
Billy. Sounds logical to me.
Hi Barry, I'll take a shot.
1. Balls touching, easy shot: Ball A that's hit gets forward momentum, but can't move there because of ball B. Also, because you don't hit it straight on, it gets some sideward momentum. So it has to move, but where? Ball A is in a squeeze between the cue ball and ball B. Ball A going backward is unimaginable, and going forward is not possible because of ball B. So going right angle is the only compromise it can take between two impossibilities.
2. Balls touching, strong shot: A fast cue ball hitting harder moves the whole three-ball constellation slightly forward before ball A can leave it. So the squeeze-out happens later. Also, a cogwheel effect should be considered, i.e. when the cue ball hits harder, A rotates B counter-clockwise a little bit more than on an easy shot before the balls part.
3. Balls just not touching: I assume ball A hits ball B not dead center, but slightly to the right. If I'm not wrong, at 04:54 you can see that ball B went slightly left, as opposed to the first shot where ball B went to the right.
George. As you can see, a lively debate has emerged, this is how the game moves on and we all learn from each other, wonderful.
i think it would be much easier to understand what's actually happening if we would considered the blue ball as a ghost ball (but without removing it) and the actual direction of the shot is on the line that is formed when the cue ball and the blue ball touch.
i also noticed that the red ball is always going perpendicularly to the path of the blue which is the natural angle of this shot.
Long time fan Barry. I think I may have the answer you're looking for. Imagine that in your first example the blue was the cue ball and the red was the object ball, at that instant in time where they are making contact. The force provided by your actual cue ball gave your blue 'cue' ball the energy and direction with which it struck the red, and the result is that you sent the red down the line of the table and sunk the blue 'cue' on the in off. In fact every shot where you demonstrated this technique, you'd been sinking the ball which was acting as if it was the cue ball. I hope this makes sense - the red is the object, the coloured ball is the 'cue', the actual cue ball is, for want of a better analogy, the cue. The fact that the balls have to touch for this to work is the clue, the physics is the same as what you'd get if the blue ball wasn't there and you'd struck the red full on the face with the cue ball, sending the red down the table and the white into the pocket.
Nathan. Thanks for your contribution, it certainly opened up a lively debate and some sensible answers.
You're right Barry, numerous forces at "play". As with other reactions the more reds you put touching each other and the blue the harder you can hit as they fight the force of the direction of the shot, they may also increase the " bounce" effect though. Please post your results. Great education Good luck Kyren
Colin. Great to have the debate and thanks for your contribution and well wishes for Kyren.
Blue ball has kinetic energy that could be split into parallel and perpendicular vectors.
Since contact area between balls is a point, and contact time is very short - blue ball being constrained from the back by red ball can only get perpendicular energy, while red ball being contacted on the perfectly parallel point can only acquire parallel energy vector. Because balls are touching, the red ball gets full parallel energy, just like in Newton's cradle. This is perfect situation, for perfect balls and no spin obviously.
Michal. Very well explained, thank you.
Hello M. Stark. During a match yesterday, I potted a black and played for a red just below the pink spot. The problem is that I cannoned another red and the cue ball stopped about a 1/4 inch from the intented red. Now, I could have played straight to the center pocket but decided to play safe to avoid doing a push shot. So my question is this : in this kind of situation, is there a way to make a ball travel a reasonnable distance by hitting it full in the face when you are very close to it without doing a push shot? Thank you for all your videos! Eric, Quebec City.
Musique. 1/4 inch is awfully close and avoiding a push shot is difficult. The only way it could be done is to raise the cue butt almost vertical so that you are striking down on the cue ball. Getting any substantial movement on the object ball will still be tricky and certainly a degree of accuracy will be lost.
That's what I thought. Since the cue ball was near the pink spot, it would have been difficult to get enough elevation on the cue. I guess I made the right decision by playing safe.Too tricky for me!!
Thanks a lot, M. Stark.
It is only my opinion.
First, the three balls are of similar weight and dimension. The good point is the pace of the cue ball. Snooker balls work within collision theory taking into account of the similar masses of the balls . When the blue ball was hit with a lighter pace, the momentum of the cue ball was relatively similar to the combined weight of the two balls itself. So, when the cue ball hits from a tangential side of the blue ball, the incoming momentum of the cue ball impart a force to the blue ball which is directly in touch with the red ball. The blue originally had to move in the imparted direction of the cue ball. However, being blocked by the similar weight displaces the direction of the motion to the minimum possible resultant path. Due to which the blue ball behaved perpendicular to the red ball. The red ball behaved on the straight line because the transfer of the momentum happened exactly at the center of gravity as it was touching the blue ball.
Thus, when the cue ball was hit with a greater pace, the momentum was bigger enough to move the two balls in contact before transferring the momentum. So, the resultant path was deviant from the perfect collision path. If the blue ball would have been hit thicker around the center of the blue ball, the impact would have resulted in stopping the blue ball and transferring all the momentum to the red ball. When we looked closer, the red ball path would also be deviant when the two balls were hit with a greater pace.
It is also important to take the direction of the impacting momentum of the cue ball. If the cue ball would have been hit from a more acute angle closer to the center pocket, the path of the blue ball would behave differently.
Now, when the blue ball and red ball were apart, there was a loss of energy and a part of the momentum displacement had already taken effect before the blue ball hitting the inertial red ball. So, the blue ball was actually having a momentum a fraction of seconds before hitting the red ball thus making the deviated displacement.
Nanao. Thanks for your answer, there have been several others well worth reading below.
Good luck to Kyren in the final tomorrow!
oghallam. Thanks for the well wishes, he never quite made it though but it wasn't for the lack of trying.
I got a question. When down on a shot feathering, or even hitting the ball, i understand that the cue should be close to the body.
What if it's held against the body to help guide it in a straight line? Should it be better this way? If not, then why not?
Would aprreciate some opinion from you guys.
Thank you.
Chow. Most modern players play with the cue against the body, ( see the shine on their waistcoat) if you do not support the cue with the body it demands so much from your technique and it is very difficult to be consistent.
hello barry stark... i had a simple question to be cleared about... does the pink in the start of the frame pots to the corner pocket... i mean while setting the frame... pls clear... thanks
sanjay. At the start of the frame the apex red should be positioned as close to the pink ball as possible without touching it. This will then mean that the pink ball cannot be potted directly into either corner pocket.
Mr stark, I have been playing for a few months now and have developed a rudimentary pre shot routine and cue action. Recently I have heard of people imitating tv professional players pre shot routines and cueing action to there benefit and improvement, is this worth doing to start off and build on that or should I work on creating my own unique style and routine?
Ciaran. It is always a good idea to emulate good players up to a point even though ultimately you are an individual and your own playing style should be allowed to emerge. I always used to admire the cue action of John Parrot, it was level, methodical and yet very simple, ideal for a beginner to copy. Please look him up on RUclips.
The tangent line which is 90 degrees from contact of the ball. this can happen all over the table given that the tangent line leads straight to the pocket from the ball where it must contact leads straight to your target. You can use this in many other ideas such as instead of the object ball carom off of another ball. you can use the cue ball and easily figure out the exact direction it will travel off of the object ball. This tangent line is effected by spins as well, so if you hit the cue ball in a way where it will be sliding by the time it contacts the object ball it will travel the tangent line. However if the cue ball is rolling or if you add top spin to the shot the tangent line will be pushed forward, verses if the ball is spinning backwards by contact the tangent line will be pulled back. A lot of us American pool players use this knowledge to our advantage considering the amount of cue ball control that is necessary in our cue sports. I believe that with the harder shot taken on the blue was thrown consider the possibility that perhaps the amount of power you delivered could have been the necessary amount to produce side spin onto the blue which may have had a throw effect on it. This has sparked my curiosity though I will try this out when I'm at the pool tournament today on a practice table and try using a striped ball to see if there is any side spin on it. I will let ya know what I find out.
Joseph. Thanks for that, its always good to know why things happen rather than just knowing that they do happen.
Unlucky to Kyren best of wishes to him and you Barry, very sorry for him.
Teejay. Thanks for that, it was a big occasion for him.
Congrats sir and Kyren !
Arbaz. Thanks for congratulations and support.
Hi Barry I've been watching your videos for years now and I'm so grateful.. but I have a problem with fidgeting my elbow and wrist around not so much the wrist anymore but seems to be my elbow a lot more.. I've tried what seems like everything and still am.. sometimes it's good other times not or during a high break it seems to wobble around.. I've heard pulling your shoulder or anything with tension involved is bad so I don't know how to solve this..please help?
I just need to feel comfortable in the position and line of my elbow
Kinhu. You are right about tension, it is bad in any area and will adversely affect your game. Providing you are taking up something like a natural position and there is no physical abnormality the elbow should fall into the reasonable limits of a recognised position. Study my video on the grip, concentrating on the front of the hand and then it is just practise to groove that cue action.
Kyren was outstanding. You should be very proud.
Martin. Many thanks, I certainly am very proud of him.
It’s simple path of least resistance, when you add more power the red becomes less resistant therefore alters the path the blue takes
Fubzy. Thanks for your contribution, there have been some very good answers.
It probably has to do with a double-kiss when the blue comes off that red. Struck thickly and at pace, the white may ever so slightly give the blue a second contact, throwing it off line. It would follow that this shot should work with the blue struck quite thinly and at pace; I have yet to test this hypothesis.
klieu. Don't think a double kiss takes place, there are some very good answers below. I am always in favour of lively discussion but respecting the other persons point of view.
looking forward to testing this out tomorrow!
Hi barry. Please make a video on how to play slow shots.
Hey barry , so after i reached 58 break with the club cue , i was using a kamui 1.21 from my pool cue , do i really need a cue or its the same with the club cue , what is the difference between them , i know the difference between pool cues and i have pure x hxt 65 and pure x jumb break but is it the same for snooker ?
mr. I am sorry but I do not play pool, American or the English version. The figures you quote are unfamiliar to me but I assume you are talking about American pool where you have a more robust cue for breaking off. The tolerances at snooker are much finer and we only play with one cue, this is usually a lot thinner than the standard pool cue because the balls are smaller and lighter. Some snooker players play with Kamui tips on their snooker cue and the preferred size is between 9mm and 10mm in diameter.
Congratulations for Kyren's performance!!!! He's made it to the final, great job!!!!!!!
Thanks for all the well wishes.
You are welcome sir!!!!!
Spherical objects of the same size and mass when collide leave at right angles (90º).
Arif. There have been some great answers.
Hi barry, will screw and top spin shots affect the angle of rebound too?
notold. Not really, that only affects the cue ball.
Barry Stark Snooker Coach thanks Barry.
Hi Barry, I came across a video showing Efren Rayes teaching a guy to do a similar shot with extreme draw shot and it altered the path of object ball significantly. Maybe apart from the speed of shot, type of shot may have effect too. Here is the link for reference and discussion. ruclips.net/video/beHrUWPfXe0/видео.html
2 ball touching acts like a double kiss i presume, it just bounces off. Great tip.
Robert. I don't believe a double kiss takes place but there have some very good answers below.
Congrats to Kyren today!! What a match!! Btw answer below
I am a Theoretical Physics student at Queen’s University Belfast
And this happens because, since the balls are touching, they are considered one mass. When the cue ball strikes the “one mass” the blue and red ball move with the of the velocity of the cue ball but perpendicular to each other , so momentum is conserved.
When the velocity of the cue ball is slow the component of the blue ball (in the direction of the red ball) is small so the deviation is less, however when the velocity is greater this same component is much larger therefore the resultant velocity has a greater angle i.e greater deviation.
This only works when the two balls are touching because of the “one mass” and momentum must be conserved. If not they will not move perpendicular to each other.
Adrian Mc Cay This was a perfect explanation. Thank you.
You have to calculate the angle,your explanation is good but the mass doesnot exactly carry the velocity of cue ball,you to calculate how much it carries through the conservation of momentum....
legoir juama that would only apply with linear momentum but the two balls have velocities in different vector planes. If you made it linear, cos(90) = 0 so has no effect on the i vector (red ball direction) and vice versa. However, this is not an elastic collision, so the balls wont have the same as the cue ball but this is not because of conservation of momentum
Adrian Mc Cay exactly it is not an elastic collison so you cannot expect the joint mass to have the velocity that cue ball had,and also the mass is twice as heavy than the cue ball (since balls are touching and behave as one unit with twice the mass) , and also you can model this system as nearly elastic collision and the linear and angular momentum conservation principle holds good.
I imagine the harder shot has enough energy to force it beyond the obstacle slightly. Or it causes more friction between the object balls creating ball rotation. Or because the ball is fast enough to touch the rebounding red twice. No idea really!
Tyrone. I admire your honesty.
Congratulations Coach!! Kyren moved to final.. 🎉🎊
Mustafa. Thanks for that.
What accent does Barry have? Sounds like a classic dialect I've heard somewhere before but can't place my finger on it. Is it Stoke per chance?
PomBare. Lived in Stafford for a few years maybe that rubbed off a little.
Ah right, I felt like I'd heard your voice before, and it came to me - Stoke City's commentator Nigel Johnson, very similar to my ear anyway. Thanks for the reply, great channel.
I can't be the only one noticing how unusually mr Barry pronounces "touching". :D
Why did the frame 10 re-rap in final??? What is that rule?
Mustafa. Both players agreed that the frame was going nowhere so asked the referee if they could have a re- rack. The only other option was for them to keep rolling up, hardly inspiring snooker.
thanks coach
I get it and it’s simpele. Bouncing of right away, makes the ball go into the pocket. But if the objectball first takes over the speed of the white for a certain distance, you will get a result angle, and the objectball will not pot.
A. Bakker. It does require some practise to determine what works and what doesn't
Hi sir stark. I would say that this is a simple plant. I don't think that rebound is appropriate for it. I learned this "trick" about 10 years ago. If you place the balls slightly apart, your object ball is going to hit the other ball at a different angle, hence the different trajectory.
But... but... i don't really understand why it travels differently when hit harder.
Anyway, you can place it a more acute angle (something like an impossible angle when trying to pot blue ball without the other ball into the middle pocket) and it still works. Try it. Haha.
Cheers.
Chow. There have been some very interesting answers below, please have a read.
It happens because of the throw effect of the cue ball into the object ball...
Akee. I thank you for your contribution but there are some very good answers below.
Please wish kyren good luck in today's final
andy. Thanks for your well wishes.
Blue pots due to 90 degree angle rule... When two balls strike with each other they always leave at 90 degree angle.. .. Blue pots when toching becoz 90 degree is directly towards pocket.... When blue and red are not touching the 90 degree between red and blue (when they contact each other) is not towards pocket... Thats why blue moves towrds jaw when blue and red not touchng...
Go over to Dr. Dave's RUclips channel. He covers the physics of pool comprehensively and also does experiments regarding the physics of the game.
SirNoobs. Good point, thanks.
I tried my best to explain using an image: imgur.com/a/exemM
First of all, this can be wrong.. it is my personal thoughts.
After contact the white exerts an extra small force cause by the elastic deformation being reverted, which causes the blue ball to drift to the left. The harder the short, the farther the blue will get deflected.
This can be further investigated, I believe the geometric non-linearity of the deformation causes this issue, which is an advanced topic in material science. A slow motion study can also clarify and answer a lot of questions.
I am no expert in this, I hope I didn't throw a fatal mistake :D
Mohammad. Your contribution is very much appreciated.
Does the angle at which the blue is hit has s role it seems that that the direction of the force is important here as if only energy transfer imbalance was the only determinant a blue ball hit fully in the face should go to the side pocket. So more like 2 vectors here and is more pronounced as the stroke force increases. No physics just logic.
Yasser. As long as the blue is hit off centre it goes towards the side pocket, obviously some experimentation is needed to determine the exact line because conditions influence it slightly but the principle remains.
I learnt about this shot years ago. But I don't think I've ever seen it played in a professional match. Anybody remember it ever being played?
timtranslates. It is fairly common for a professional to attempt to play one ball off another, but for the balls to land in such a position that the shot cannot be missed is obviously quite rare.
Haven’t played snooker in a long time. maybe I will start playing again :D
Cam. I hope so, the more the merrier.
Barry Stark Snooker Coach definitely will. quite a fun game.
awesome
gonna have some fun with this trick with my friends
Kyren was amazing today
Daniel. The boy did good didn't he.
And how to make follow back
Rocky. I have no need to answer this, the lads below have answered it for me. I will only add do not try to run before you can walk. Start easy and close progressing to hard and further away.
And how to make tc from yellow to black
Hi Barry, good coaching channel, here is your answer as to why: When you play softly(like in your example), the blue ball gets a very tiny right spin from friction between blue and red. Shooting harder, there is no friction, the balls just slide off each other. Now back to you: Doesn't the nap of the cloth play a factor as well? I believe so.
This answer is nowhere near being right.
hahaha that is both so rude and so wrong little troll man. Let's hear your 'right' answer
There are correct answers given already (energy conservation).
Martin. There have been some great answers and well worth reading up about the physics involved.
Congratulations to kyren today
Harrison. Many thanks.
Come on kyren do the buisness today. I got a great feeling and how well he held it together. Well done Barry 👍👍👍
Woody. Thanks for your support.
Hi Barry,
Have a wee watch of this video featuring Stephen Hendry, some Snooker physics.
ruclips.net/video/muIxj-bR4FI/видео.html
It explains the 90 degree rule.
What is happening, is the white ball is going off 90 degrees from the blue ball and the blue ball will also always go 90 degrees from its contact with the red.
Although the white will not look as though its going 90 degrees because the blue instantly hits the red and changes its direction to 90 degrees from the red.
This is still happening even with the gap between them, the blue and red will go off each other in 90 degrees its just that the initial contact is not at the right angle to send the blue into the pocket. You can see this in your video, the blue still goes 90 degrees, just that the inch or two it moves first is putting the 90 degrees above the pocket.
This principle could be useful for figuring out if you're going in off a pot.
Watch a liv boeree and Stephen hendry vid she is incredible smart and a science genius and she goes into depth about the equations of the 90’ angle in snooker which happens in every shot nearly. Plz take time out to watch but be warned she’s smart and extremely beautiful. The perfect woman. Just type Stephen hendry liv boeree thanks Barry 👍👍👍🏴🏴🏴
It’s actually the pyjsics of snooker with SH and LB. enjoy lol
Woody. Thanks for that information.