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I recently created a Patreon account for people who want to help support my channel. The link is on my RUclips home page. Also, in case, you have not already seen them, I uploaded several other videos recently. As always, for each video that you like, you can help more people find it in their RUclips search engine by clicking the like button, and writing a comment. Lots more videos are coming very soon. Thanks.
+Physics Videos by Eugene Khutoryansky I m watching your video 9th class and now I m 1st year(11th class) and still watching................. Your physics videos, animations and explanation are the best...............
Physics Videos by Eugene Khutoryansky You're one of the best teachers I've had in physics, but somethings been boggling my mind for a while and this video is a perfect opportunity to ask. Could you please explain how the smaller object when colliding with the bigger one(2.25) does not stop. I know in real life it would bounce off but according to Newton's laws of motion it shouldn't. According to Newton's third law, there should be an equal and opposite reactionary force on the smaller ball when it applies a force on the bigger ball and since force is equal to the change of momentum, when the bigger ball applies the equal and opposite force, the smaller ball should stop as the force it exerts is equal to it's momentum. This doesn't happen in real life. Something that may help you that I've thought of, is from a different example. Consider the smaller ball now stationary, and the bigger ball is moving toward it at a constant velocity. Same situation but the roles switched. When the bigger ball hits the smaller ball, I used to think the bigger ball should stop as the smaller ball produces an equal and opposite force to stop it. But then I realised that the bigger ball does not have to exert its full momentum onto the smaller ball, but only enough so that the move at a similar speed. So the momentum of the larger ball only decreases by a smaller amount as it takes less force to get the smaller ball moving at the same speed. That's my reasoning, unfortunately it does not explain what I mentioned earlier. My reasoning lead me to think that the smaller ball has to exert a larger force than its momentum can give to the larger ball, but it then gets cancelled out when the larger ball exerting the same amount of extra force to the smaller ball making it move in the opposite direction. However the reasoning mentioned in the last paragraph alludes to there being a conservation of velocity which definitely sounds untrue. I hope you read and understand my long winded messy post and give some kind of solution based on what you can understand of what I am saying, I hope I'm not wasting your time, sorry :)
VERY well presented. Being a young adult yearning off the knowledge of theoretical physics, I found this video to be sufficient and explanatory. Great work, Eugene!
You can help translate this video by adding subtitles in other languages. To add a translation, click on the following link: ruclips.net/user/timedtext_video?v=PNHSIEO-KOQ&ref=share You will then be able to add translations for all the subtitles. You will also be able to provide a translation for the title of the video. Please remember to hit the submit button for both the title and for the subtitles, as they are submitted separately. Details about adding translations is available at support.google.com/youtube/answer/6054623?hl=en Thanks.
@ Not necessarily true. I've earned a degree in Physics but getting a Doctorates in Electrical engineering. In other words, there is a physics background even if it's scope is just courses in physics. Electrical engineers are required to take physics as part of their program.
Suddenly I get the appropriateness of 'The Blue Danube' (think 2001). Docking with the space station is an exercise in balancing angular momentum as well. Bravo!
Please allow the download button on this video....then I can watch it another few hundred times on my television. Your videos are always high quality due to the clear and concise instructions. Thanks you for putting the time into educating everyone.
This lecture is like listening a speech in a Royal Party (by closing eye) Feels like present in the 1st Class Prog. in something like the Titanic. Excellent Video
Hi Eugene, very nice video! Could you make a video about the dzhanibekov effect (instability when rotating around the intermediate axis of rotation). I can't grasp my head around it how angular momentum is conserved during this effect.
Thank you very much for this high quality content. You have a really good manner to explain this theoretical concept very easily. I read about moment of momentum before. I had understood the mathematics behind this object. But I could not figure out correctly how to physically represent it in real life, and the consequences of this concept. For instance, the increasing or decreasing velocity with the opposite decreasing or increasing of rotation radius. With your video is definitely very clear. There is so many other subjects you could represent and explain like this.
A very nice and clear explanation of a rather confusing topic (angular momentum). Thanks so much! Ill definitely be passing this video along to my students.
@@EugeneKhutoryansky thank you, actually. Please make videos more on physics with great animations and everything. Especially about electricity, mechanics and thermodynamics. I know you will deliver the best.
@@EugeneKhutoryansky I am very surprised by your reply sir . And like your million subscribers even I wish to be speaking with you sir (I also know that it wouldn't happen 😅. If that happens means I will reach HD1 galaxy itself sir .And within 272 days I will complete my schooling and I will be free for 3 to 4 months after that.... So due to that (it may sound stupid) can you be my greatest and wonderful and genius physics teacher?? Thank you once again sir for your free high quality videos we students are very much grateful to you.. Consider the first paragraph sir 😄
Hello Mr. or Ms. Khutoryansky, First of all your videos are amazing. Thanks to them i really started to enjoy physics , because now i can visualize the physical concepts and notions much easier and they are nomore boring ,abstract stuff. I just wanted to ask the following : Shouldn't the parallelogram in 5:08 and following 20 seconds be a triangle so the angular momentum ( the field of the triangle ) stays constant ? Thank you very much again.
question..... if the ball rotating around an axis has a certain linear momentum, by changing its distance from the center, the linear velocity has to be changed (in order to keep angular momentum constant) which means that the kinetic energy is changed without any external energy source and it seems to be violation of energy conservation. than how can that be possible ...please explain it @Eugene
To change the ball's distance from the center, a force is applied, thereby adding or removing energy from the system. The energy is being transferred to or away the source of the force.
You're one of the best teachers I've had in physics, but somethings been boggling my mind for a while and this video is a perfect opportunity to ask. Could you please explain how the smaller object when colliding with the bigger one(2.25) does not stop. I know in real life it would bounce off but according to Newton's laws of motion it shouldn't. According to Newton's third law, there should be an equal and opposite reactionary force on the smaller ball when it applies a force on the bigger ball and since force is equal to the change of momentum, when the bigger ball applies the equal and opposite force, the smaller ball should stop as the force it exerts is equal to it's momentum. This doesn't happen in real life. Something that may help you that I've thought of, is from a different example. Consider the smaller ball now stationary, and the bigger ball is moving toward it at a constant velocity. Same situation but the roles switched. When the bigger ball hits the smaller ball, I used to think the bigger ball should stop as the smaller ball produces an equal and opposite force to stop it. But then I realised that the bigger ball does not have to exert its full momentum onto the smaller ball, but only enough so that the move at a similar speed. So the momentum of the larger ball only decreases by a smaller amount as it takes less force to get the smaller ball moving at the same speed. That's my reasoning, unfortunately it does not explain what I mentioned earlier. My reasoning lead me to think that the smaller ball has to exert a larger force than its momentum can give to the larger ball, but it then gets cancelled out when the larger ball exerting the same amount of extra force to the smaller ball making it move in the opposite direction. However the reasoning mentioned in the last paragraph alludes to there being a conservation of velocity which definitely sounds untrue. I hope you read and understand my long winded messy post and give some kind of solution based on what you can understand of what I am saying, I hope I'm not wasting your time, sorry :)
Meeharbi N the reaction is the one object stopping. the force brings the object to zero so there still is a equal and opposite force but it's just the perfect amount to stop it and not have the ball move in another direction
Meeharbi N it depends also on how elastic the collision is and if energy is lost in the collision. it does happen all the time so you saying it doesn't is simply wrong
You are understanding is incorrect. Please to refer to F=ma . let m1 be the smaller ball and m2 be the bigger ball and also let's assume m1= 1kg and m2= 10kg . then after collision between the balls it is abvious the smaller ball will bounce back with greater acceleration that the bigger ball. In this case, by the equation f=ma , we can safely say that it's acceleration (lets assume m1 acceleration be a1 and m2 acceleration be a2) wil be in the ratio 10:1 so as to show f=m1.a1 = m2.a2.
What happens when the distance between the rotaing objects goes to infinity? In that case the areas seems to go to zero. Is angular momentum no longer conserved at infinity?
The video was Amazing!!! I wonder how you managed to do such stunning animations??? It was really great, keep making more videos like this... And can you tell me how were you able to create these 3d animations did you use any software o'what? Pls, tell I would like to know???
Thanks for the compliment. I make my 3D animations with "Poser", and I do some of the simulations with an add-on purchased separately called "Poser Physics", in addition to the built in simulator called "Bullet Physics." Poser is expensive, but there are also free 3D animation programs available, such as "Blender" and "Daz Studio."
Thank you very much for this video! I have a question, is there a way to know why the angular momentum is at 90°? (Momentum that is apparently to the right of the object, assuming that the direction to which the object moves is the "front"). Edit: I have no idea, but if I had to guess, I'd say it's like the "residual force" from the axis, which would make the orbits to slowly lose force.
Mashallah,,what a nice and informative videos with pleasent voice,,,,,,what a student can get something from books an hour,,,he can get that in just 10 or 15 mint by watching these video,,,,,,,,,I appreciat u with open heart,,,,it is request to please upload video on fluid mechanis as well as solid mechanics
In the linear momentum example I get shocked: vectors addition leads to incoming small ball crashing with a big green one happening ā = -ā + 2*ā , the small gets away from it were coming and the other have "twice more momentum than the original"!!... so, What will happen if the green one crashed another small one in chain giving all its moment? It will result in an overall momentum of and incoming ball with momentum ā which ends in a exactly alike ball traveling with momentum 2*ā !!, which is impossible from conservation of energy!!... so my question is: Is really possible to have this ā = -ā + 2*ā collision??? My intuition says from energy conservation also must happen that (incoming momentum)^2 = (final momentum)^2, so this example leads to a^2 = a^2 + 4*a^2 which is obviously wrong, so I think that actually the scenario is impossible (if my assumption is right). Also about the parallelogram example refered to an arbitrary point: since the velocity is constant and the radii of the another vector changes more than the cosine of the angle, I believe that the area is not constant.. if the ball have travel to infinity far away the area will certainly be infinite, differently if the vector is rotating towards the point were the parallelogram is always the same. Also if something is not rotating, I believe its angular momentum is zero, so the linearly travelling ball refered to an arbitrary point is not a good example.
Holy moly this parallelogram thing is keplers equal area law , a proof for it, explaining the varying speed in elliptical orbits as the distance between the point and object varies. Holy shit
as far as i know that acceleration is the main factor responsible for the velocities changes but in the video,exactly after the perfectly collision in the situation where 2 objects moved in two different directions, i see that the velocity vectors magnitude have simultaniously changed. So my question is what acceleration have caused the velocities magnitude change like that ?
Thanks for the explanation. I am still confused, however, whether angular momentum and linear momentum are interchangeable. Can you explain more, please?
They are analogous, but not interchangeable. They are both separate quantities of motion that each are conserved in their own right. Linear momentum is defined as the product of velocity and inertia (i.e. mass), as a way to quantify the time-cumulative effect of a force. Angular momentum considers the linear momentum vector and the radius vector from a reference point, as a way to quantify the interactions that would cause rotational motion. Radius cross product linear momentum, is how we define angular momentum. You can have situations where angular momentum is conserved, while linear momentum isn't, but not vicea. They both are ultimately conserved in the universal sense. Conservation of linear momentum applies when there are no net external forces acting on the system. Either external forces add up to zero, or aren't present in the first place, or a situation happens so quickly that the external forces can be neglected (like a collision while subject to gravity). Conservation of angular momentum applies when there are no net external torques acting on a system, relative to the reference point about which angular momentum is defined. So it is OK that there be radial external forces directed parallel to the radius vector when considering conservation of angular momentum, since these forces don't apply a torque to the system. It is the external forces that are not parallel to the radius vector from the reference point, that need to be either excluded or nullified by other external forces, in order for conservation of angular momentum.
@@benjaminsisko9250 Yes. Angular momentum requires you to assign a reference point, which is usually selected as the point containing the axis of rotation. You will get a different answer if you assign a different reference point. So a problem may specify an origin to use, and in that case you need to use the point specified. Otherwise, you choose the point to assign as the reference point. It is arbitrary what point you chose to assign, although it is usually the case that one particular point will make the math a lot more convenient, and you'd be "asking for trouble" to pick a different point.
@@carultch The reference point (center point) I pick must be in inertial frame, 'coz if I choose an accelerated frame, then the situation above does not apply, right?
@@benjaminsisko9250 Depends on what kind of accelerated reference frame we are talking about. If the reference frame has a constant linear acceleration, you can use the equivalence principle and treat the apparent inertial force the same way as you would treat any other gravitational field if you were in an inertial reference frame. (Put aside the general relativity meaning of inertial reference frame that requires excluding gravitational fields, and stick to the Galilean/Newtonian meaning of the term, for our purposes). By contrast, if we are talking about a rotating reference frame, you are much better off looking outside of it, and selecting a point in the inertial reference frame. The Coriolis effect will appear to act as if it is an external torque on any system within a rotating reference frame, which will rule out using conservation of angular momentum unless you also account for the effect.
Why did we define the standard such that fermions have half-integer spin? Why not just cut the reference spin value in half, and give fermions a spin number of 1, and bosons a spin number of even integers? I'm not trying to ask rhetorically, I really would like to know what was behind setting up the standard for spin numbers in quantum mechanics, that caused half-integer spins to exist.
Please make some animations in mechanics 1 lessons...involving work-energy-power, pulley systems and projectiles...thanks a lot for the highly informative physics videos
"Linear momentum is also conserved, since we started out with a linear momentum of zero and ended up with a linear momentum of zero." ~deeply refers to "us" idly sitting, watching this video out of boredom.
+John Lux, thanks for the compliment. In reply to your question, when the Sun exerts a gravitational attraction on the Earth, the Earth exerts a gravitational attraction on the Sun. I show an animation of this in my "Laws of Motion" video. Thanks.
Good video. I´d suggest making better cuts while editing. This video could be a lot shorter without the silent 3-4 seconds transitions from animation to animation. Remember people watching can pause if they need to, don´t do it for them. Hope you read this, good luck.
When the particles repel each other while rotating ,they spin slower to keep the angular momentum constant. But how do we prove that the angular momentum of the universe is always constant during any interaction?
+Ibrahim Chahrour, this is a consequence of Newton's Laws of motion. Since for every force, there is an equal and opposite force, and F = mA, the net consequence is that momentum and angular momentum must be conserved. We also know this through experiment, in that we have always found momentum and angular momentum to be conserved for every experiment we conducted.
epic video, though I have a question, how do you calculate angular momentum? what is the main law for it? and does it have the same unit as momentum, kg.m/s?
+isb pk, the units for angular momentum is "kg*m^2/s". This is different than the units for momentum in that we have meters^2 in the equation, due to the fact that we are also multiplying by the distance between the point and the object. You can calculate the angular momentum by calculating the area of the parallelogram I showed in the video. This can be done by taking the cross product of the two vectors that made up this rectangle. This can also be done by multiplying the length of the two arrows by each other, and then multiplying this number by the sine of the angle between them.
+Shirshak Bajgain, thanks for that really great compliment, and I am glad that you liked that I used a parallelogram to explain cross product. I also have a parallelogram to explain cross product in my video on Maxwell's Laws, to explain the strength of the force create by a magnetic field on a moving charged particle. Thanks.
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My wish is to be with scientists and give you new theories and I have some theories plz 🙏🙏 help me to give my theories to world love from Pakistan.
Türkçe diline nasıl çevireceğiz.
@@TURNON111write a Article and send to a good journal for publication..
@@murugan5280 already done it but no one even published worldwide
Dear Eugene! Wowww! That's beautiful and perfect job! Congratulations
I recently created a Patreon account for people who want to help support my channel. The link is on my RUclips home page. Also, in case, you have not already seen them, I uploaded several other videos recently. As always, for each video that you like, you can help more people find it in their RUclips search engine by clicking the like button, and writing a comment. Lots more videos are coming very soon. Thanks.
+Eugene Khutoryansky You're the best, hands down best youtube subscription. Don't stop making videos!
you shold put the link to the patreon in the description of the videos.
awesome video!
+Physics Videos by Eugene Khutoryansky I m watching your video 9th class and now I m 1st year(11th class) and still watching................. Your physics videos, animations and explanation are the best...............
You and Salman Khan ( from KhanAcademy) rule when its about illustrative and clear e-learning.
Physics Videos by Eugene Khutoryansky
You're one of the best teachers I've had in physics, but somethings been boggling my mind for a while and this video is a perfect opportunity to ask. Could you please explain how the smaller object when colliding with the bigger one(2.25) does not stop. I know in real life it would bounce off but according to Newton's laws of motion it shouldn't.
According to Newton's third law, there should be an equal and opposite reactionary force on the smaller ball when it applies a force on the bigger ball and since force is equal to the change of momentum, when the bigger ball applies the equal and opposite force, the smaller ball should stop as the force it exerts is equal to it's momentum. This doesn't happen in real life.
Something that may help you that I've thought of, is from a different example. Consider the smaller ball now stationary, and the bigger ball is moving toward it at a constant velocity. Same situation but the roles switched. When the bigger ball hits the smaller ball, I used to think the bigger ball should stop as the smaller ball produces an equal and opposite force to stop it. But then I realised that the bigger ball does not have to exert its full momentum onto the smaller ball, but only enough so that the move at a similar speed. So the momentum of the larger ball only decreases by a smaller amount as it takes less force to get the smaller ball moving at the same speed. That's my reasoning, unfortunately it does not explain what I mentioned earlier. My reasoning lead me to think that the smaller ball has to exert a larger force than its momentum can give to the larger ball, but it then gets cancelled out when the larger ball exerting the same amount of extra force to the smaller ball making it move in the opposite direction.
However the reasoning mentioned in the last paragraph alludes to there being a conservation of velocity which definitely sounds untrue. I hope you read and understand my long winded messy post and give some kind of solution based on what you can understand of what I am saying, I hope I'm not wasting your time, sorry :)
Beethoven - Moonlight Sonata (1st Movement)❤️. Let's go!!
Not to mention 'On The Beautiful Blue Danube', which always transports me to a Pan-Am space shuttle docking with the space station...
the best explanation on angular momentum on youtube,period
Thanks for the compliment about my explanation.
VERY well presented. Being a young adult yearning off the knowledge of theoretical physics, I found this video to be sufficient and explanatory. Great work, Eugene!
Literally learning this right now in my physics course. Thank you!
you deserve much more views I think it's bcz of you long channel name -a simple advice from a regular viewer thanks a lot
Karan Agarwal absolutely
It’s his name.
@@cssstylescommand4 "Physics Videos by [Name]" could be shortened to just this name
@@ThomasBomb45I think a bit longer but self-explanatory channel name would be "[Name]'s Physics".
You can help translate this video by adding subtitles in other languages. To add a translation, click on the following link:
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Thanks.
Your video is older than the Bugatti Chiron. Wow
So are you a physics professor or something? How do you know all this stuff and how do you manage to describe it all in such an intuitive manner?
+Virusnzz He's an Electrical Engineer!
@ Not necessarily true. I've earned a degree in Physics but getting a Doctorates in Electrical engineering. In other words, there is a physics background even if it's scope is just courses in physics. Electrical engineers are required to take physics as part of their program.
That is so untrue lol.
@@Spacetime_ghost richard feynman started as a biologist
@@elijahjflowers so that proves that most people who don't do physics can explain it better?
Shining Star of Physics.
Always stay blessed...
Thanks!
You really are the bollocks Eugene, I have watched all your videos several times over now. Wonderfully accessible 👍
My favorite channel ❤ قناتي المفضلة
Glad to hear that. Thanks.
Amazing thank you, keep going on
Glad you liked it. More videos are on their way.
Suddenly I get the appropriateness of 'The Blue Danube' (think 2001). Docking with the space station is an exercise in balancing angular momentum as well. Bravo!
Best explanation I have ever seen in my life
Thanks for the compliment about my explanation.
Best ever explanation I found on the net! Great Work! Pls. Keep going.
Thanks. I am glad you liked my explanation. More videos are on their way.
I genuinely love this channel!
Thanks. I am glad to hear that.
Please allow the download button on this video....then I can watch it another few hundred times on my television. Your videos are always high quality due to the clear and concise instructions. Thanks you for putting the time into educating everyone.
you cleared my concepts on conservation of linear momentum sir,
+Vineet Dubey, Glad I was able to help.
Thank u thank u thank u, i’ve learned and understand more of ur 20min videos than years of school😍❤️
This lecture is like listening a speech in a Royal Party (by closing eye)
Feels like present in the 1st Class Prog. in something like the Titanic.
Excellent Video
Glad you liked my video. Thanks.
Hi Eugene, very nice video! Could you make a video about the dzhanibekov effect (instability when rotating around the intermediate axis of rotation). I can't grasp my head around it how angular momentum is conserved during this effect.
i love this Channel and i really appreciate all the efforts.
Thanks. I am glad you like my videos.
Literally!!!!!! Hats off miss
Thanks.
Thank you very much for this high quality content. You have a really good manner to explain this theoretical concept very easily.
I read about moment of momentum before. I had understood the mathematics behind this object. But I could not figure out correctly how to physically represent it in real life, and the consequences of this concept. For instance, the increasing or decreasing velocity with the opposite decreasing or increasing of rotation radius. With your video is definitely very clear.
There is so many other subjects you could represent and explain like this.
Thank for the compliments about my video. I have many other videos on my channel in which I explain other subjects in this manner. Thanks.
A very nice and clear explanation of a rather confusing topic (angular momentum). Thanks so much! Ill definitely be passing this video along to my students.
Thanks for the compliment about my video. I hope your students like it.
Your videos are masterpieces
Thanks for the compliment.
Wow one of the best explanation
Thanks a lot ❤❤❤❤
Thanks for the compliment. I am glad you liked my explanation.
Best explanation ever found. Keep it coming
Thanks for the compliment.
@@EugeneKhutoryansky thank you, actually. Please make videos more on physics with great animations and everything. Especially about electricity, mechanics and thermodynamics. I know you will deliver the best.
This makes exterior algebra visually obvious. Thank you. Poor ol' Hermann Grassmann was just born too early.
Thanks.
I wish i had a teacher like you Eugene
+Premed1981, thanks.
I love how the music shifted to Blue Danube as angular momentum was discussed...
I became a fan of yours Eugene! Bravo! You are an awesome person! Greetings from Brazil.
+Eduardo Nogueira, thanks for the compliment, and I am glad to have you as a fan.
+Eugene Khutoryansky I love you 😭
I just want to say that this video is wow 🙀🙀
I am glad you liked my video.
@@EugeneKhutoryansky I am very surprised by your reply sir . And like your million subscribers even I wish to be speaking with you sir (I also know that it wouldn't happen 😅. If that happens means I will reach HD1 galaxy itself sir .And within 272 days I will complete my schooling and I will be free for 3 to 4 months after that.... So due to that (it may sound stupid) can you be my greatest and wonderful and genius physics teacher??
Thank you once again sir for your free high quality videos we students are very much grateful to you..
Consider the first paragraph sir 😄
Everything is always explained so well. Thank you
Hello Mr. or Ms. Khutoryansky,
First of all your videos are amazing. Thanks to them i really started to enjoy physics , because now i can visualize the physical concepts and notions much easier and they are nomore boring ,abstract stuff.
I just wanted to ask the following :
Shouldn't the parallelogram in 5:08 and following 20 seconds be a triangle so the angular momentum ( the field of the triangle ) stays constant ?
Thank you very much again.
You'll notice the bottom and top get wider as height decreases. So, area field is still constant, and angular momentum is conserved.
This video is amazing, thank you so much
Thanks for the compliment.
Thankyou so much, Your videos are literally awesome 🙌🏻✨
Thanks for the compliment. I am glad you like my videos.
I love this channel
Thanks. Glad to hear that.
Great video again!
Thanks.
Such a beautiful and thorough explanation!
Thanks. I am glad you liked my explanation.
Thanks.
question..... if the ball rotating around an axis has a certain linear momentum, by changing its distance from the center, the linear velocity has to be changed (in order to keep angular momentum constant) which means that the kinetic energy is changed without any external energy source and it seems to be violation of energy conservation. than how can that be possible ...please explain it @Eugene
To change the ball's distance from the center, a force is applied, thereby adding or removing energy from the system. The energy is being transferred to or away the source of the force.
This was amazing!
Thanks. I am glad you liked my video.
A fantastic educational video as always
You're one of the best teachers I've had in physics, but somethings been boggling my mind for a while and this video is a perfect opportunity to ask. Could you please explain how the smaller object when colliding with the bigger one(2.25) does not stop. I know in real life it would bounce off but according to Newton's laws of motion it shouldn't.
According to Newton's third law, there should be an equal and opposite reactionary force on the smaller ball when it applies a force on the bigger ball and since force is equal to the change of momentum, when the bigger ball applies the equal and opposite force, the smaller ball should stop as the force it exerts is equal to it's momentum. This doesn't happen in real life.
Something that may help you that I've thought of, is from a different example. Consider the smaller ball now stationary, and the bigger ball is moving toward it at a constant velocity. Same situation but the roles switched. When the bigger ball hits the smaller ball, I used to think the bigger ball should stop as the smaller ball produces an equal and opposite force to stop it. But then I realised that the bigger ball does not have to exert its full momentum onto the smaller ball, but only enough so that the move at a similar speed. So the momentum of the larger ball only decreases by a smaller amount as it takes less force to get the smaller ball moving at the same speed. That's my reasoning, unfortunately it does not explain what I mentioned earlier. My reasoning lead me to think that the smaller ball has to exert a larger force than its momentum can give to the larger ball, but it then gets cancelled out when the larger ball exerting the same amount of extra force to the smaller ball making it move in the opposite direction.
However the reasoning mentioned in the last paragraph alludes to there being a conservation of velocity which definitely sounds untrue. I hope you read and understand my long winded messy post and give some kind of solution based on what you can understand of what I am saying, I hope I'm not wasting your time, sorry :)
Meeharbi N the reaction is the one object stopping. the force brings the object to zero so there still is a equal and opposite force but it's just the perfect amount to stop it and not have the ball move in another direction
Meeharbi N it depends also on how elastic the collision is and if energy is lost in the collision. it does happen all the time so you saying it doesn't is simply wrong
You are understanding is incorrect.
Please to refer to F=ma .
let m1 be the smaller ball and m2 be the bigger ball and also let's assume
m1= 1kg and m2= 10kg .
then after collision between the balls it is abvious the smaller ball will bounce back with greater acceleration that the bigger ball.
In this case, by the equation f=ma , we can safely say that it's acceleration (lets assume m1 acceleration be a1 and m2 acceleration be a2) wil be in the ratio 10:1 so as to show f=m1.a1 = m2.a2.
downloading your all videos.so love form Pakistan.God Bless U
FINALLY, I UNDERSTOOD ANGULAR MOMENTUM
I am glad my video helped with the understanding of this topic.
@@EugeneKhutoryansky 😊
Really well done, guys. 👍
Thanks.
What happens when the distance between the rotaing objects goes to infinity? In that case the areas seems to go to zero. Is angular momentum no longer conserved at infinity?
Excellent video as ever!
+saksham chauhan, thanks. Glad you liked it.
Thanks for the video!
Thanks.
Tq for this vid can u plz tell which software u use or how u make such informative vid plz
I make my 3D animations with "Poser."
The video was Amazing!!!
I wonder how you managed to do such stunning animations??? It was really great, keep making more videos like this...
And can you tell me how were you able to create these 3d animations did you use any software o'what? Pls, tell I would like to know???
Thanks for the compliment. I make my 3D animations with "Poser", and I do some of the simulations with an add-on purchased separately called "Poser Physics", in addition to the built in simulator called "Bullet Physics." Poser is expensive, but there are also free 3D animation programs available, such as "Blender" and "Daz Studio."
@@EugeneKhutoryansky Thank you so much for taking the trouble to answer me your videos are really INCREDIBLE!!!
Awesome job !💡
Thanks for the compliment.
Beautiful!
Thanks.
it is interesting that it is momentum which is constant instead of mass
I love your videos.
Great job.
Thanks for the compliment. I am glad you like my videos.
Thank you very much for this video!
I have a question, is there a way to know why the angular momentum is at 90°? (Momentum that is apparently to the right of the object, assuming that the direction to which the object moves is the "front").
Edit: I have no idea, but if I had to guess, I'd say it's like the "residual force" from the axis, which would make the orbits to slowly lose force.
This is just the way we chose to define the term "angular momentum." This definition happens to be useful for calculations. Thanks.
Hi Eugene, your videos are awesome. As always. What software do you use to make these animations? Tks in advance.
Thanks for the compliment. I make my 3D animations with "Poser."
Thank you so much. Amazing explanation.
Thanks. I am glad you liked my video.
Mashallah,,what a nice and informative videos with pleasent voice,,,,,,what a student can get something from books an hour,,,he can get that in just 10 or 15 mint by watching these video,,,,,,,,,I appreciat u with open heart,,,,it is request to please upload video on fluid mechanis as well as solid mechanics
Thanks for the compliment. I would like to eventually do a video on fluid mechanics, and a video on solid mechanics. Thanks.
It's ok for momentum explanation . What what is parallelogram and that purple object concept ????🤔🧐
the area of the parallelogram being constant shows that the angular momentum is conserved.
How do these objects behave in "The real universe"? How does gravity and the ether effect the motions?
ちょうど学校で習ってたのでありがとう😭
So simple, and so beautifully explained.
+XxKINGatLIFExX, thanks for the compliment.
Physics Videos by Eugene Khutoryansky Np, keep up the good work. Have you got any vids on Quantum Mechanics and Space?
Thanks.
+XxKINGatLIFExX, yes I have many videos on those topics. Just check out my RUclips home page.
Will do thanks!
In the linear momentum example I get shocked: vectors addition leads to incoming small ball crashing with a big green one happening ā = -ā + 2*ā , the small gets away from it were coming and the other have "twice more momentum than the original"!!... so, What will happen if the green one crashed another small one in chain giving all its moment? It will result in an overall momentum of and incoming ball with momentum ā which ends in a exactly alike ball traveling with momentum 2*ā !!, which is impossible from conservation of energy!!... so my question is: Is really possible to have this ā = -ā + 2*ā collision??? My intuition says from energy conservation also must happen that (incoming momentum)^2 = (final momentum)^2, so this example leads to a^2 = a^2 + 4*a^2 which is obviously wrong, so I think that actually the scenario is impossible (if my assumption is right).
Also about the parallelogram example refered to an arbitrary point: since the velocity is constant and the radii of the another vector changes more than the cosine of the angle, I believe that the area is not constant.. if the ball have travel to infinity far away the area will certainly be infinite, differently if the vector is rotating towards the point were the parallelogram is always the same. Also if something is not rotating, I believe its angular momentum is zero, so the linearly travelling ball refered to an arbitrary point is not a good example.
Holy moly this parallelogram thing is keplers equal area law , a proof for it, explaining the varying speed in elliptical orbits as the distance between the point and object varies. Holy shit
this guy is a god damn genius I swear. No other videos, books, or articles explain and visually represent these abstract concepts so clearly.
Thanks for the compliment.
Hello Eugene, I'm confused by the first statement. Did you ignore Noether's theorem? Since energy is not conserved according to general relativity.
Whether energy is conserved in General Relativity is still up for debate. In any case, you can view this as a video just about classical physics.
as far as i know that acceleration is the main factor responsible for the velocities changes but in the video,exactly after the perfectly collision in the situation where 2 objects moved in two different directions, i see that the velocity vectors magnitude have simultaniously changed. So my question is what acceleration have caused the velocities magnitude change like that ?
Acceleration is not a cause. Acceleration is a mathematical description of motion. Acceleration is the effect, when a mass is subject to a net force.
very educational, enlightening, intuitive! Wow.!
Thanks. Glad you liked my video.
Thanks for the explanation. I am still confused, however, whether angular momentum and linear momentum are interchangeable. Can you explain more, please?
They are analogous, but not interchangeable. They are both separate quantities of motion that each are conserved in their own right. Linear momentum is defined as the product of velocity and inertia (i.e. mass), as a way to quantify the time-cumulative effect of a force. Angular momentum considers the linear momentum vector and the radius vector from a reference point, as a way to quantify the interactions that would cause rotational motion. Radius cross product linear momentum, is how we define angular momentum.
You can have situations where angular momentum is conserved, while linear momentum isn't, but not vicea. They both are ultimately conserved in the universal sense.
Conservation of linear momentum applies when there are no net external forces acting on the system. Either external forces add up to zero, or aren't present in the first place, or a situation happens so quickly that the external forces can be neglected (like a collision while subject to gravity).
Conservation of angular momentum applies when there are no net external torques acting on a system, relative to the reference point about which angular momentum is defined. So it is OK that there be radial external forces directed parallel to the radius vector when considering conservation of angular momentum, since these forces don't apply a torque to the system. It is the external forces that are not parallel to the radius vector from the reference point, that need to be either excluded or nullified by other external forces, in order for conservation of angular momentum.
So, it's about different point of view... angular momentum requires a well defined center point, right? Thanks for your explanation, @@carultch.
@@benjaminsisko9250 Yes. Angular momentum requires you to assign a reference point, which is usually selected as the point containing the axis of rotation. You will get a different answer if you assign a different reference point. So a problem may specify an origin to use, and in that case you need to use the point specified. Otherwise, you choose the point to assign as the reference point.
It is arbitrary what point you chose to assign, although it is usually the case that one particular point will make the math a lot more convenient, and you'd be "asking for trouble" to pick a different point.
@@carultch The reference point (center point) I pick must be in inertial frame, 'coz if I choose an accelerated frame, then the situation above does not apply, right?
@@benjaminsisko9250 Depends on what kind of accelerated reference frame we are talking about. If the reference frame has a constant linear acceleration, you can use the equivalence principle and treat the apparent inertial force the same way as you would treat any other gravitational field if you were in an inertial reference frame. (Put aside the general relativity meaning of inertial reference frame that requires excluding gravitational fields, and stick to the Galilean/Newtonian meaning of the term, for our purposes).
By contrast, if we are talking about a rotating reference frame, you are much better off looking outside of it, and selecting a point in the inertial reference frame. The Coriolis effect will appear to act as if it is an external torque on any system within a rotating reference frame, which will rule out using conservation of angular momentum unless you also account for the effect.
THIS VID DESERVES KUDOS!!!!!!!
+konda babu, thanks.
Angular momentum is quantum, and is known in the quantum world as "spin." Bosons have a integer spin, and fermions have a half-integer spin.
Why did we define the standard such that fermions have half-integer spin? Why not just cut the reference spin value in half, and give fermions a spin number of 1, and bosons a spin number of even integers?
I'm not trying to ask rhetorically, I really would like to know what was behind setting up the standard for spin numbers in quantum mechanics, that caused half-integer spins to exist.
Please make some animations in mechanics 1 lessons...involving work-energy-power, pulley systems and projectiles...thanks a lot for the highly informative physics videos
Thanks a lot for this beautiful explanation 😃❤️
Thanks. I am glad you liked my explanation.
Love the song. And of course the truth
No doubt great video but for me the background music was too loud and disturbing...
"Linear momentum is also conserved, since we started out with a linear momentum of zero and ended up with a linear momentum of zero." ~deeply refers to "us" idly sitting, watching this video out of boredom.
eugene, love your work and thank you
question -- if we have two objects attracted by gravity, what is the equal and opposite force of that attraction?
+John Lux, thanks for the compliment. In reply to your question, when the Sun exerts a gravitational attraction on the Earth, the Earth exerts a gravitational attraction on the Sun. I show an animation of this in my "Laws of Motion" video. Thanks.
Good video. I´d suggest making better cuts while editing. This video could be a lot shorter without the silent 3-4 seconds transitions from animation to animation. Remember people watching can pause if they need to, don´t do it for them.
Hope you read this, good luck.
Excellent explanation
I am glad you liked my explanation. Thanks for the compliment.
When the particles repel each other while rotating ,they spin slower to keep the angular momentum constant.
But how do we prove that the angular momentum of the universe is always constant during any interaction?
+Ibrahim Chahrour, this is a consequence of Newton's Laws of motion. Since for every force, there is an equal and opposite force, and F = mA, the net consequence is that momentum and angular momentum must be conserved. We also know this through experiment, in that we have always found momentum and angular momentum to be conserved for every experiment we conducted.
Brilliant explanation. Thanks.
Thanks for the compliment.
your videos are wonderful.
Thanks for the compliment. I am glad you like them.
So why do moons/stars spin backwards creating an angular problem?
Do you intend to make more videos about linear algebra?
+Rodrigo Appendino, yes. I plan to make more videos on linear algebra, in addition to the one that I already have on that topic. Thanks.
+Eugene Khutoryansky YES PLEASE!!! Linear Algebra! :))))
Yes. An amazing presentation. Very informative.
Thanks. I am glad you liked my video.
epic video, though I have a question, how do you calculate angular momentum? what is the main law for it? and does it have the same unit as momentum, kg.m/s?
+isb pk, the units for angular momentum is "kg*m^2/s". This is different than the units for momentum in that we have meters^2 in the equation, due to the fact that we are also multiplying by the distance between the point and the object. You can calculate the angular momentum by calculating the area of the parallelogram I showed in the video. This can be done by taking the cross product of the two vectors that made up this rectangle. This can also be done by multiplying the length of the two arrows by each other, and then multiplying this number by the sine of the angle between them.
Wow. Great intuitive concept :)
I must say no teacher is better than you :)
I really like the way that you showed cross product :)
+Shirshak Bajgain, thanks for that really great compliment, and I am glad that you liked that I used a parallelogram to explain cross product. I also have a parallelogram to explain cross product in my video on Maxwell's Laws, to explain the strength of the force create by a magnetic field on a moving charged particle. Thanks.
such a wonderful videos , thank you .
+Abduzayir Abdukadir, thanks. I am glad that you like my videos.
Vieja, sos un crack. Great! Thanks!
Hi Eugene, could you explain why an object showing the Dzhanibekov effect during rotation is conserving its angular momentum?
I will add the Dzhanibekov effect to my list of topics for future videos. Thanks.
I legitimately just used this to spend an hour analyzing why chimps are such better swingers than humans 😂😂
Very good explanation and very good voice
Thanks for the compliments.
Awesome
Thanks for do this videos, i wanna be like you, greetings from colombia
So beautiful
+PT Yamin, thanks. Glad you liked it.
great videos
+Jack Specht, thanks.