Pure rolling without friction?

In summary, a rigid ball can have pure rolling with constant velocity on a rigid level without friction. The rolling is caused by the inertia of the mass, countered by a tangential force at the bottom caused by friction. Without friction, the ball would just spin in place. If you wanted it to move horizontally, you would have to push it as the two motions (spin and horizontal velocity) would be independent. It is possible to achieve this in a universe designed to have these specific conditions.
  • #1
persia7
39
0
suppose a rigid ball have pure rolling with constant velocity on rigid level without friction , is it possible ?
 
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  • #2
What causes the 'rolling'? Isn't it the inertia of the mass countered by a tangential force at the bottom caused by friction? Otherwise it would be sliding.
 
  • #3
If you ignored friction just between the surfaces (otherwise getting it rolling in the first place would be difficult), you could get the ball to "spin" but it would do so in place. If you wanted it to move as well you'd have to push it. The two motions (spin and horizontal velocity) would be independent (I don't think the spin would have any reactionary influence on the velocity without friction, but I'm not certain).

Anything is possible if you design a funky universe around desired conditions.
 

1. What is pure rolling without friction?

Pure rolling without friction is a form of motion in which an object, such as a wheel, rotates without any slipping or sliding. This means that the point of contact between the object and the surface it is moving on has no relative motion.

2. How is pure rolling without friction different from regular rolling?

In regular rolling, there is a small amount of slipping or sliding between the object and the surface it is moving on, which creates friction. In pure rolling without friction, there is no slipping or sliding, so there is no friction.

3. What are the conditions necessary for pure rolling without friction to occur?

In order for pure rolling without friction to occur, the object must have a perfectly round shape and the surface it is moving on must also be perfectly smooth. Additionally, there can be no external forces acting on the object, such as gravity or friction.

4. What are the real-life applications of pure rolling without friction?

Pure rolling without friction is commonly seen in situations where wheels or balls are used, such as in sports equipment, vehicles, and even in rolling suitcases. It is also important in understanding the dynamics of circular motion in physics.

5. Can pure rolling without friction ever be achieved in real-life?

No, it is not possible to achieve pure rolling without friction in real-life because there will always be some amount of friction present. However, in situations where the amount of friction is very small, we can approximate pure rolling without friction.

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