Rolling Friction: Does Work Occur on Rolling Objects?

In summary, friction does not do any work on an object purely rolling as the point of contact never moves. However, for something rolling without slipping, there may be static friction which does no work. Rolling friction, on the other hand, is caused by deformation of surfaces and is typically smaller than kinetic friction. This is often ignored in basic problems. If rolling friction is ignored, then mechanical energy would be conserved. The term "rolling resistance" is often used to describe the force opposing rolling motion due to deformation and hysteresis.
  • #1
ashishsinghal
462
0
Does friction does any work on an object purely rolling? Would mechanical energy be always conserved when when an object rolls?
I feel that friction does no work as the point of contact never moves. So there will be no change in energy.
Am I having conceptual error?
 
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  • #2
For something rolling without slipping, there may be static friction, which does no work. However rolling friction is something else entirely. That has to do with deformation of the surfaces and is usually smaller than kinetic friction. Often it's ignored in elementary problems.
 
  • #3
So mechanical energy would be conserved right?
 
  • #4
ashishsinghal said:
So mechanical energy would be conserved right?
If you ignore rolling friction, yes.
 
  • #5

FAQ: Rolling Friction: Does Work Occur on Rolling Objects?

1. What is rolling friction?

Rolling friction is a type of force that resists the movement of rolling objects. It occurs when an object rolls over a surface, such as a ball rolling on the ground or a wheel rolling on a road.

2. How does rolling friction differ from other types of friction?

Unlike static or kinetic friction, which occur when two objects are in contact and at rest or in motion, rolling friction occurs when an object is rolling. It is also generally lower than static or kinetic friction, making it easier for objects to move.

3. Does work occur on rolling objects?

Yes, work does occur on rolling objects. This is because as the object rolls, friction between the object and the surface causes a force to be applied in the opposite direction of motion. This force requires energy to overcome, thus work is being done.

4. How does the weight of an object affect rolling friction?

The weight of an object affects rolling friction by increasing the downward force that is applied to the surface. This increases the friction between the object and the surface, making it more difficult for the object to roll and thus increasing the amount of work required.

5. Can rolling friction be reduced?

Yes, there are ways to reduce rolling friction. One way is to use smoother and harder surfaces, such as using ball bearings in wheels. Another way is to reduce the weight of the object, which decreases the downward force and thus reduces the amount of friction. Additionally, lubricants can be used to reduce the friction between the object and the surface.

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