Your ticket has been rejected. It works as intended. It is not a bug it's a feature ;) Ps. Sorry for long response time, we have quite a queue of complains here...
I understand this! Most rotors can tilt on its own because of its precession. Bikes can keep upright itself, even without moving because of the precession of a rotor.
The precessing wheel appears to twist the string in which it hangs, by which the string produces a counter-torque. The energy needed for that comes from gravity and that's why the wheel's axle tips down, lowering its center of gravity. Nonetheless, we see that the precession doesn't yield a centripetal force (the inital swing was caused by the operator). This indicates that the precession has no angular rmomentum in the kinetic sense!
@tiaxanderson The right hand rule does apply to electromagnetism, but it also applies to torque and angular momentum as well (curl the fingers of your right hand in the direction of the rotation and your thumb points in the direction of angular momentum). If you look carefully, the direction of precession is opposite to what you should expect to conserve angular momentum (it should be precessing clockwise as viewed from above).
Very true! This is about Angular momentum The wheel wont fall because the sum of forces on horizontal axis is 0 F=mg (the gravity for the wheel is in the down direction ) its also seen in the tension of the wire: T=-mg (the sign is because the vector is in the opposed direction: up)
The law of conservation of angular momentum. A spinning object wants to keep spinning unless acted upon. A big old rock tumbling in space, whatever. But something engineered like a spear or a wheel will tend to keep the same stable orientation around it's axis. The faster it is spinning the more stable the orientation.
nope thats not how it works dude. In a nutshell- the torque applied on the wheel is upwards and by spinning the wheel it gets some angular momentum here the wheel stays there as the angular momentum is chasing towards torque.
The angular inertia is what keeps it upright. The precession is what causes it to slowly rotate around the vertical axis. The wheel spinning about one axis causes the other 2 axes to be coupled. The effect is easier to understand when you hold the wheel with both hands and try to tilt it. This wouldn't make a good video because you can't see it, but you can feel it when you try. An analogous coupling occurs with a floor buffer: If you want to move it left/right, you have to tilt it forward/backward. Very confusing if you've never used one before.
The center of gravity of the wheel is in its axis. Gravity causes a moment (F*r) because we have a rotating point, away from the center of gravity. Any explanation for the shown phenomenon must explain how the spinning wheel provides a moment, countering the moment of gravity. So how does this countering moment comes about?
now Torque is the rate of change of angular momentum and the torque by gravity happens to point perpendicular to the angular momentum vector; and because the wheel is rigidly attached to the baton which is pivoted at the rope, the result is seemingly rotational motion rather than downward motion (specifically, precession)
@ghuegel forward momentum forces your bike to go to the path of least resistance and most bikes are well ballanced so the wheel will stay straight until u hit a bump and crash the more speed the greater the effect
@TrueXile420 Yes, the force vector responsible for the rotation follows the "right-hand" rule, where your fingers point in the direction of the wheel rotation, and the rotational force vector is your thumb as it sticks our perpendicular to your fingers.
@metalheadone The size of the object should not matter. All that matters is that it acts as a gyroscope (like the bicycle wheel). It is simple physics. If you are curious look up angular momentum and angular acceleration.
So is the torque the same as a motor, I mean a metal object rotating in a magnetic field? What would happen if the entire wheel were plastic? Is it a static electric force that creates the torque? It does have the right hand rule just like electricity in a wire.
@optionsnone 2nd and third gyro's being ferro liquid filled tubes fixed at 90 degrees to each other. Liquid spinning via electro magnetism. First being a normal gyro.
Ok, because the axle is connected on one side only, the tendency is to apply an angular force to make the wheel hang back to the original (motionless) position at the start of the experiment. However, as the wheel is now rotating, this force is precessed through 90 degrees in the direction of wheel rotation about its axle, and this force then rotates the wheel in the normal (yaw) axis while it spins.
So if we put a motor on this wheel, to spin it faster and faster and keep it rotating, what would it do. Seems like you could use this effect on all the 4 propellers of a hover car to make it stable ( like the AR.Drone or Moeller Skycar).
Nope, it is spining in the correct sense, as it should spin in the direction of the torque, as the variation of angular momentum is the torque. torque = r x F, and F is the weight, which is pointing down.
the segment from the baton to the wheel can be taken to be the moment arm R, and it intersects the wheel at the center which can be taken to be the center of mass, so the gravitational force F can be considered to be applied entirely at that point...R x F = Torque (x is the cross product of two vectors)...the wheel already has angular momentum because it is spinning and the angular momentum vector L points perpendicular to the wheel's plane of rotation
No. Many physics textbooks still say that gyroscopic effects keep a bicycle upright, but this is no longer accepted by experts. The bike can still be ridden even when counter-rotating coaxial wheels are used to negate the gyroscopic effect.
wheel have two functions works as wheel and "air shield" at the same time to keep wheels straight and hold the bicycle ,,, i knew know how bicycle works ^_^ thanks uploader for this nice explanation
I have done somethig diferent, i have manage build a device that controls centrifugal force to produce variable linear force in a direction that may be altered at any time by the operator with some rotating weighted arms i've make the 360 degres centrifugal for to be on 180 degres with 1:1 ratio, that mens that i control the pulling force.
If you kept the wheel spinning with some type of motor, would it then stay vertical? Or does it just dampen the effect of gravity and it would still eventually fall.
Yes, I suppose you're right. We don't really know why gravity occurs... But as far as the main things in this demonstration we have it understood. @thefencejumperengine:- Thank you, it's nice to see someone keeping a cool head and giving sound advice.
you mean he gave in angular momentum in a vertical direction, that's why it stays. L has to stay constant, so the wheel's velocity has to maintain its direction while the radius and the mass of the wheel remain the same.
There are lot of misinterpretations in physics with regard to Angular Momentum. That is because some accepted faulty theorizations remained unchallenged for centuries.What is the use of hand rules if the founder himself had a clear idea of the mechanism behind the phenomenon? Erection of a hanged cycle wheel can be explained easily without any reference to the gloomy theory of 'Conservation of Angular Momentum'. What are the parameters which do matter upon the phenomenon? 1. Rotating speed of the wheel 2. mass of the rotating part of the wheel 3. Radius of the bearing (ball bearing, roller bearing or sleeve bearing etc.) 4. Friction of the bearing 5. Angle of inclination of the axle You would agree with no arguments on 1st and 2nd parameters because the relation is clear enough. But about the 3rd reason you would argue ‘How radius of the bearing does matter’ with it? The perpendicular force ’Fp’ is a centrifugal force and it depends on the distance from rotating axis to the frictional surface on which the wheel is rolling. The entire wheel load is shouldered by the axle at the top region of the bearing as shown in the figure-04. Even if we don’t notice it, the wheel is just rolling over that point while rotating. The ‘action’ is the resistance of the bearing and ‘reaction’ is the centrifugal force due to rolling. The force of reaction proportionate to shift of rolling surface from the rotating axis and therefore radius of the racer bearing becomes important. You can observe it by yourself doing the same experiment by use of a very small bearing fixed to a very lean axle and observe the wheel would not be erected. Then you may question ‘how friction of the bearing affects upon this matter? Frictional force is the ‘action’ applied against the rotary system. If the action is weak then the reaction too becomes weak. Therefore use a 100% frictionless racer (if possible) and observe the wheel would not be erected as a proof of the theory. Also use an old corroded racer bearing and observe how easily the wheel is erected. “What is the importance of the inclination of the axel?” then you may ask. I can answer this by a similar question such as, “why don’t you hang your apparatus sharply vertical?” You can weld a hook at the end of the axle and hang the thing sharply vertical and then you would observe no erection at all. And why is that? That is because the wheel weight should be loaded only upon one side of the axle to create a perpendicular reaction. Therefore no erecting force is induced within the wheel whereas the axle is kept sharply vertical. You can do the experiment in a space laboratory under zero gravity conditions. However much speedy the wheel could be rotated there no erection would be observed because no wheel load is applied upon the axle. Therefore give up those unnecessary hand rules and gloomy theorizations whence things could be clearly explained mechanically. (pl ref 'Theory of Action & Perpendicular Reaction' for more)
@mclmatty But you can "ghost-ride" a bike by jumping off while it's moving. It stays upright much longer than if it weren't moving, even if it's going perfectly straight. Are you sure this effect doesn't help keep upright while riding?
I just can't see a computer game's physics engine ever getting something like a gyroscope right without specific programming for that phenomenon. When I see stuff like that though, it just reminds me why I love physics in the first place :D
The equations are simple so it wouldn't be hard to program. Perhaps some flight simulators have gone this far. An engine jamming might cause the plane to tilt.
OR, they just did an experiment with 2 optical clocks. Time slows down in a clock moving less then about 35km/h relative to its twin(gyros center). Time speeds up in a clock that is hoisted a mere 33cm above its twin(Time speeds up the farther you get from the center).So, the center of the gyro is slowing down time and its spinning wheel is speeding up time. Gyros align with TIME, like spacetime.
Now the torque due to gravity would tend to cause the wheel to have angular momentum in the same direction as the torque. The wheel is also spinning so it has angular momentum along the axis of rotatiion. Shouldn't the angular momentum along the axis of rotation always remain constant since no torque acts along the axis of rotation. In other words, only the angular momentum point in the same direction as the torque should change.
@dresdenk I though I remembered reading in the old RIDER bike magazine, about some dude who was trying to break a land speed record @ Bonneville and kept crashing off the course.. perhaps because he had been counter steering to try to stay in the middle of the course, but when he had achieved a certain speer, counter steering just made matters worse.
The bigger the wheel the lower Rpms you need. Which means the force is mostly coming from the outer part where the speed is greater. Maybe the difference between the speed of the inner part of the wheel and the outer part have something to do with this effect. It would be interesting to see the giroscopic effect on a wheel that has the same momentum (when spun at a certain speed) in the inner and outer parts of it.
@jugeorge1 As a former motorcycle rider I had read years ago the following that was ascribed to gyroscopic precession: when driving a motorcycle of bicycle belowa certain speed (i think about 23 mph) to go left you turn the handlebars left. BUT above that speed to go left you turn the handlebars to the right. BUT above some other speed (300mph or so) it reverts back to turn left to go left.. Can you confirm whether that is true? Everyone I mention this to scoffs at it
@djkrugger That is completely false, above 25 or so mph (this depends on how large your motorcycle wheels are) you counter steer and the motorcycle leans over for you. The only time you use your body weight is for aggressive maneuvers such as in racing to maintain traction and in emergency situations. Learn to ride before you hurt yourself. @BillAndersonNS you are describing counter steering , and most of the time you do it without even noticing. I don't know about the 300mph though.
@superafterburner Ok - I'll follow that... But it is very ambiguous. I actually don't know the proper answer to that question - it's been a while since I actually did the physics for it. It's something to do with the angular momentum of the wheel resisting the acceleration due to gravity, and turning that downward acceleration into a twisting motion. I would need to look it up in one of the textbooks to give a proper answer though.
this reminds me of an experiment we used to do at uni, same thing only a person holds the wheel whilst sitting on an office chair and they slowly turn in circles from the momentum :)
@ swirlingabyss ok, now only for good measure, a simple model to test you: suppose you have such a wheel, which is now complete massless. now you fix two (equal) masses on the circumference of the wheel, one exactly across from the other. now you do the same thing as in the video, and the same will happen. describe now the motion of one of these masses not in terms of angular momentum (so dont use this word) and explain why it should behave like in the video.
No. Gravity is not ignored ha ha. The wheel stays that way because of something called angular momentum that is acting in the direction of the shaft of the wheel.
For extra credit, hold the spinning wheel in your hands by the axle and try to turn it like you were going around a corner. And you thought you were telling the bicycle to lean...
Ok to fully understand this phenomena, you'll have to understand newton's 1st law which is like the underlying principle behind the law of conservation of momentum.. An object will always stay in its current state of motion unless an external force is being applied to it.. When the bicycle wheel spins, the particles in the wheel are all moving in a certain orientation.. in order to change the orientation of this motion, a larger force must be applied.. Gravity does not suffice.. So it stays in
@djkrugger : to avoid the dog who runs out in from of you, I was taught to give a HARD tug on the handle bar in the opposite direction and the bike would immediately change heading
It's related to how much angular momentum the spinning tire has. If the tire is heavier or spinning faster, the angular momentum will be larger. It also depends on where the weight is concentrated: If most of the weight is concentrated at the axle, the angular momentum is very low. Thus demonstration tires like the one in the video often have weight added to the outer rim.
![Felix "Unfair" | [Stray Kids : SKZ-PLAYER]](http://i.ytimg.com/vi/Oswujxm2Ag0/mqdefault.jpg)
"God?" "Yes, my child?" "I'd like to file a bug report."
Your ticket has been rejected. It works as intended. It is not a bug it's a feature ;)
Ps. Sorry for long response time, we have quite a queue of complains here...
@@grlt23 bro it's been 10 years lol
@@luhdooce 11 now
@@justalazyguy.0_0 13 now
99 now
I understand this! Most rotors can tilt on its own because of its precession. Bikes can keep upright itself, even without moving because of the precession of a rotor.
The precessing wheel appears to twist the string in which it hangs, by which the string produces a counter-torque. The energy needed for that comes from gravity and that's why the wheel's axle tips down, lowering its center of gravity. Nonetheless, we see that the precession doesn't yield a centripetal force (the inital swing was caused by the operator). This indicates that the precession has no angular rmomentum in the kinetic sense!
It´s not a bug it´s a feature.
@tiaxanderson
The right hand rule does apply to electromagnetism, but it also applies to torque and angular momentum as well (curl the fingers of your right hand in the direction of the rotation and your thumb points in the direction of angular momentum).
If you look carefully, the direction of precession is opposite to what you should expect to conserve angular momentum (it should be precessing clockwise as viewed from above).
Very true!
This is about Angular momentum
The wheel wont fall because the sum of forces on horizontal axis is 0
F=mg (the gravity for the wheel is in the down direction ) its also seen in the tension of the wire: T=-mg (the sign is because the vector is in the opposed direction: up)
Wrong 🤓
The law of conservation of angular momentum. A spinning object wants to keep spinning unless acted upon. A big old rock tumbling in space, whatever. But something engineered like a spear or a wheel will tend to keep the same stable orientation around it's axis. The faster it is spinning the more stable the orientation.
that just describes a plain ol spinning wheel though. more significantly, this is a demo of precession
nope thats not how it works dude.
In a nutshell-
the torque applied on the wheel is upwards and by spinning the wheel it gets some angular momentum here the wheel stays there as the angular momentum is chasing towards torque.
The angular inertia is what keeps it upright. The precession is what causes it to slowly rotate around the vertical axis. The wheel spinning about one axis causes the other 2 axes to be coupled. The effect is easier to understand when you hold the wheel with both hands and try to tilt it. This wouldn't make a good video because you can't see it, but you can feel it when you try.
An analogous coupling occurs with a floor buffer: If you want to move it left/right, you have to tilt it forward/backward. Very confusing if you've never used one before.
The center of gravity of the wheel is in its axis. Gravity causes a moment (F*r) because we have a rotating point, away from the center of gravity. Any explanation for the shown phenomenon must explain how the spinning wheel provides a moment, countering the moment of gravity.
So how does this countering moment comes about?
now Torque is the rate of change of angular momentum and the torque by gravity happens to point perpendicular to the angular momentum vector; and because the wheel is rigidly attached to the baton which is pivoted at the rope, the result is seemingly rotational motion rather than downward motion (specifically, precession)
@xerxeese when you spin your arm around it's not black holes it's citrifugal force pushing blood down to your fingertips
@watscrick the right hand rule only explains that the angular momentum is perpendicular to the wheel. It says nothing about the direction of rotation.
@ghuegel forward momentum forces your bike to go to the path of least resistance and most bikes are well ballanced so the wheel will stay straight until u hit a bump and crash the more speed the greater the effect
@TrueXile420
Yes, the force vector responsible for the rotation follows the "right-hand" rule, where your fingers point in the direction of the wheel rotation, and the rotational force vector is your thumb as it sticks our perpendicular to your fingers.
@metalheadone The size of the object should not matter. All that matters is that it acts as a gyroscope (like the bicycle wheel). It is simple physics. If you are curious look up angular momentum and angular acceleration.
So is the torque the same as a motor, I mean a metal object rotating in a magnetic field? What would happen if the entire wheel were plastic? Is it a static electric force that creates the torque? It does have the right hand rule just like electricity in a wire.
I've always loved this physics demo.
@benpie12 Forward momentum explains why it keeps moving forward (duh) but not why it takes longer to fall down.
@optionsnone 2nd and third gyro's being ferro liquid filled tubes fixed at 90 degrees to each other. Liquid spinning via electro magnetism. First being a normal gyro.
no, it does not create a new gravitational field, it builds up angular momentum, which keeps it up.
Ok, because the axle is connected on one side only, the tendency is to apply an angular force to make the wheel hang back to the original (motionless) position at the start of the experiment. However, as the wheel is now rotating, this force is precessed through 90 degrees in the direction of wheel rotation about its axle, and this force then rotates the wheel in the normal (yaw) axis while it spins.
So if we put a motor on this wheel, to spin it faster and faster and keep it rotating, what would it do. Seems like you could use this effect on all the 4 propellers of a hover car to make it stable ( like the AR.Drone or Moeller Skycar).
Nope, it is spining in the correct sense, as it should spin in the direction of the torque, as the
variation of angular momentum is the torque. torque = r x F, and F is the weight, which
is pointing down.
If Angular momentum has to be conserved, why is the wheel's axis when it is horizontal is not staying in one direction?
the segment from the baton to the wheel can be taken to be the moment arm R, and it intersects the wheel at the center which can be taken to be the center of mass, so the gravitational force F can be considered to be applied entirely at that point...R x F = Torque (x is the cross product of two vectors)...the wheel already has angular momentum because it is spinning and the angular momentum vector L points perpendicular to the wheel's plane of rotation
No. Many physics textbooks still say that gyroscopic effects keep a bicycle upright, but this is no longer accepted by experts. The bike can still be ridden even when counter-rotating coaxial wheels are used to negate the gyroscopic effect.
It looks like the torque produced by the twisted thread is having same effect if it was a non-rotating (static) wheel.
@beundead im sure theres a part of it we havent figured out yet... but for the most part, yes we have figured it out.
@eisv most near? its nearest, and no it is not. The closest thing to antigravity are mag-lev trains and airplanes.
Is this why I can ride my bike with no hands? Because the wheel wants to stay straight and when I slow down it gets harder to balance?
wheel have two functions works as wheel and "air shield" at the same time to keep wheels straight and hold the bicycle ,,, i knew know how bicycle works ^_^ thanks uploader for this nice explanation
I have done somethig diferent, i have manage build a device that controls centrifugal force to produce variable linear force in a direction that may be altered at any time by the operator with some rotating weighted arms i've make the 360 degres centrifugal for to be on 180 degres with 1:1 ratio, that mens that i control the pulling force.
very cool.. its hard to see how fast its really spinning, but its definitely hauling ass.
If you kept the wheel spinning with some type of motor, would it then stay vertical? Or does it just dampen the effect of gravity and it would still eventually fall.
Go home wheel. You're drunk.
Haha
Yes, I suppose you're right. We don't really know why gravity occurs...
But as far as the main things in this demonstration we have it understood.
@thefencejumperengine:- Thank you, it's nice to see someone keeping a cool head and giving sound advice.
you mean he gave in angular momentum in a vertical direction, that's why it stays. L has to stay constant, so the wheel's velocity has to maintain its direction while the radius and the mass of the wheel remain the same.
but if the precession is blocked would it hang to one side?
There are lot of misinterpretations in physics with regard to Angular Momentum. That is because some accepted faulty theorizations remained unchallenged for centuries.What is the use of hand rules if the founder himself had a clear idea of the mechanism behind the phenomenon? Erection of a hanged cycle wheel can be explained easily without any reference to the gloomy theory of 'Conservation of Angular Momentum'.
What are the parameters which do matter upon the phenomenon?
1. Rotating speed of the wheel
2. mass of the rotating part of the wheel
3. Radius of the bearing (ball bearing, roller bearing or sleeve bearing etc.)
4. Friction of the bearing
5. Angle of inclination of the axle
You would agree with no arguments on 1st and 2nd parameters because the relation is clear enough. But about the 3rd reason you would argue ‘How radius of the bearing does matter’ with it?
The perpendicular force ’Fp’ is a centrifugal force and it depends on the distance from rotating axis to the frictional surface on which the wheel is rolling. The entire wheel load is shouldered by the axle at the top region of the bearing as shown in the figure-04.
Even if we don’t notice it, the wheel is just rolling over that point while rotating. The ‘action’ is the resistance of the bearing and ‘reaction’ is the centrifugal force due to rolling. The force of reaction proportionate to shift of rolling surface from the rotating axis and therefore radius of the racer bearing becomes important.
You can observe it by yourself doing the same experiment by use of a very small bearing fixed to a very lean axle and observe the wheel would not be erected.
Then you may question ‘how friction of the bearing affects upon this matter?
Frictional force is the ‘action’ applied against the rotary system. If the action is weak then the reaction too becomes weak.
Therefore use a 100% frictionless racer (if possible) and observe the wheel would not be erected as a proof of the theory. Also use an old corroded racer bearing and observe how easily the wheel is erected.
“What is the importance of the inclination of the axel?” then you may ask.
I can answer this by a similar question such as, “why don’t you hang your apparatus sharply vertical?”
You can weld a hook at the end of the axle and hang the thing sharply vertical and then you would observe no erection at all. And why is that? That is because the wheel weight should be loaded only upon one side of the axle to create a perpendicular reaction. Therefore no erecting force is induced within the wheel whereas the axle is kept sharply vertical.
You can do the experiment in a space laboratory under zero gravity conditions. However much speedy the wheel could be rotated there no erection would be observed because no wheel load is applied upon the axle. Therefore give up those unnecessary hand rules and gloomy theorizations whence things could be clearly explained mechanically. (pl ref 'Theory of Action & Perpendicular Reaction' for more)
+Cyril Gamage whom are you even talking to?
+JazzRadioFfm Anyone curious enough to take an interest.
+JazzRadioFfm you would say, "To whom are you talking?"
I’d put it all on red this man knows his stuff and definitely has an English accent
You forgot 6: Field
@mclmatty But you can "ghost-ride" a bike by jumping off while it's moving. It stays upright much longer than if it weren't moving, even if it's going perfectly straight. Are you sure this effect doesn't help keep upright while riding?
I just can't see a computer game's physics engine ever getting something like a gyroscope right without specific programming for that phenomenon.
When I see stuff like that though, it just reminds me why I love physics in the first place :D
even if someone did manage to program it innately, it would look like a bug and get 'fixed' haha
The equations are simple so it wouldn't be hard to program. Perhaps some flight simulators have gone this far. An engine jamming might cause the plane to tilt.
ya i know i wonder if there going to start using it
Yo this goes hard
nice demonstration
Does this have anything to do with Kinetic Energy or Potential Energy?
what if the change in direction of rotation of wheel.
OR, they just did an experiment with 2 optical clocks. Time slows down in a clock moving less then about 35km/h relative to its twin(gyros center). Time speeds up in a clock that is hoisted a mere 33cm above its twin(Time speeds up the farther you get from the center).So, the center of the gyro is slowing down time and its spinning wheel is speeding up time. Gyros align with TIME, like spacetime.
Why does not the projection of the string pass through the CG?
This is a profound question. Would be interesting to try positioning the spinning wheel there and see if it stays.
@ghuegel its called forward momentum
Now the torque due to gravity would tend to cause the wheel to have angular momentum in the same direction as the torque. The wheel is also spinning so it has angular momentum along the axis of rotatiion. Shouldn't the angular momentum along the axis of rotation always remain constant since no torque acts along the axis of rotation. In other words, only the angular momentum point in the same direction as the torque should change.
dude is the best tech instructor ever!
MIT is one of the goodest coliges.
@dresdenk I though I remembered reading in the old RIDER bike magazine, about some dude who was trying to break a land speed record @ Bonneville and kept crashing off the course.. perhaps because he had been counter steering to try to stay in the middle of the course, but when he had achieved a certain speer, counter steering just made matters worse.
yes high enough to balance the torque exerted on the wheel by gravitation
The bigger the wheel the lower Rpms you need.
Which means the force is mostly coming from the outer part where the speed is greater.
Maybe the difference between the speed of the inner part of the wheel and the outer part have something to do with this effect.
It would be interesting to see the giroscopic effect on a wheel that has the same momentum (when spun at a certain speed) in the inner and outer parts of it.
All wrong u got 0 marks its because of angular momentum conservation
Does this means a front bike wheel (as an example) would typically pull to the left?
@sharkriup it is real, done in any physics class room. Google the gyroscopic effect / conservation of angular momentum
so where's the seat?
@jugeorge1 As a former motorcycle rider I had read years ago the following that was ascribed to gyroscopic precession: when driving a motorcycle of bicycle belowa certain speed (i think about 23 mph) to go left you turn the handlebars left. BUT above that speed to go left you turn the handlebars to the right. BUT above some other speed (300mph or so) it reverts back to turn left to go left.. Can you confirm whether that is true? Everyone I mention this to scoffs at it
@jjpineda13 what about the counter torque generated by the string wanting to twist back to equilibrium?
@bluhgh It has been explained many years ago. But the formula that demonstrates the phenomenon is complicated.
what would happen if you rotated a magnetic liquid in a vortex?
Does it stay at any angle if the rotational speed is high enough?
Uttam purush🔥
conservation of angular momentum. Or how matter acts rather weird when rotated.
i was amazed when i saw this done............in elementary school science class about 20 years ago.
@djkrugger That is completely false, above 25 or so mph (this depends on how large your motorcycle wheels are) you counter steer and the motorcycle leans over for you. The only time you use your body weight is for aggressive maneuvers such as in racing to maintain traction and in emergency situations. Learn to ride before you hurt yourself.
@BillAndersonNS you are describing counter steering , and most of the time you do it without even noticing. I don't know about the 300mph though.
what are the materials used can anybody tell me ?
Magic
Salsa
Omg One Of The Stupidest Questions Ever
Can anyone explain in detail the physics behind this?
does milky way system precession like this ?l
@superafterburner
Ok - I'll follow that...
But it is very ambiguous.
I actually don't know the proper answer to that question - it's been a while since I actually did the physics for it. It's something to do with the angular momentum of the wheel resisting the acceleration due to gravity, and turning that downward acceleration into a twisting motion. I would need to look it up in one of the textbooks to give a proper answer though.
WHERE CAN I GET THIS WHEEL SET UP
Gandalf, he has a lot of magic items
It's basically just a bicycle tire with weight added to the rim. Maybe you can use a power drill to get it spinning very fast
it's not an experiment, it's a demonstration. He is demonstrating how rotation momentum works.
What is that demonry?
this reminds me of an experiment we used to do at uni, same thing only a person holds the wheel whilst sitting on an office chair and they slowly turn in circles from the momentum :)
thats why i love the phisics
@DJxBash nah, its just simple balance and center of gravity
Yay for conservation of angular momentum =]
@ swirlingabyss
ok, now only for good measure, a simple model to test you: suppose you have such a wheel, which is now complete massless. now you fix two (equal) masses on the circumference of the wheel, one exactly across from the other.
now you do the same thing as in the video, and the same will happen.
describe now the motion of one of these masses not in terms of angular momentum
(so dont use this word) and explain why it should behave like in the video.
so why is gravity ignored? be cause of the speed (of light)? :)
No. Gravity is not ignored ha ha. The wheel stays that way because of something called angular momentum that is acting in the direction of the shaft of the wheel.
Because it is a non existent force.
how to we make this?
For extra credit, hold the spinning wheel in your hands by the axle and try to turn it like you were going around a corner. And you thought you were telling the bicycle to lean...
Ok to fully understand this phenomena, you'll have to understand newton's 1st law which is like the underlying principle behind the law of conservation of momentum.. An object will always stay in its current state of motion unless an external force is being applied to it.. When the bicycle wheel spins, the particles in the wheel are all moving in a certain orientation.. in order to change the orientation of this motion, a larger force must be applied.. Gravity does not suffice.. So it stays in
how does an electronic gyroscope work?
Hall effect
@djkrugger : to avoid the dog who runs out in from of you, I was taught to give a HARD tug on the handle bar in the opposite direction and the bike would immediately change heading
What is the mechanism you used to spin the tire? Is that something you made, or something you can buy? I'd love this for my 5th grade classroom!
can this be done with a smaller object, or is it somehow tied to how much the object weighs?
It's related to how much angular momentum the spinning tire has. If the tire is heavier or spinning faster, the angular momentum will be larger. It also depends on where the weight is concentrated: If most of the weight is concentrated at the axle, the angular momentum is very low. Thus demonstration tires like the one in the video often have weight added to the outer rim.
why gyroscope or rotating wheel oppose the external force..
It's not so much opposing as it is trying to maintain it's current axis of rotation, same as a body in motion stays in motion unless acted upon.
i had class about the gyroscope today on my pilotschool :) in instrumentation and we did the same with a bicycle wheel
ur old now
I Really Like The Video A bicycle wheel is suspended from one of end of its axie by a rope, and spun up by hand From Your
its called sine motion or something similiar
lol @ ciiwwii..........why are wheels round?
@oilyear
fall?
now I realise how easy it is to bike without hands as long as the wheel spins at a high rate
What is gyroscope?
@BillAndersonNS 300mph huh?
Cool vid.
Just because it's MIT, I'm gonna say surely you know how to deinterlace?
What was the name of that force?
Inercia?
@wtfzeb One is not stupid for not understanding this. It`s not simple at all.
also the same experiment is starting at 36:00