Can Sliding Friction Affect a Rolling Disk?

In summary, a disk rolling on a flat horizontal surface will experience both rolling and sliding friction, contrary to the claim that only rolling friction will act on the body. This is because the point of contact between the disk and the surface is at rest, allowing for the possibility of sliding friction. Additionally, air friction may also play a role in the movement of the disk.
  • #1
sulabh64
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Homework Statement


a disk is rolling on a flat horizontal surface.only rolling friction will act on the body.(true/false).ans false WHY?a body rolls.therefore sliding friction can't act on body.(true/false).ans. false WHY?


Homework Equations





The Attempt at a Solution


since the point of contact is at rest with respect to the surface (rolling condition) therefore no sliding friction must be there.
 
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  • #2
The question seems to be relying on vagueness and technicalities to trick you :frown:

Technically, a rolling disk may also be sliding if it has an initial rotational speed that differs from the linear tangential speed; The speeds would eventually match as friction worked to equalize them.

Technically, a rolling disk may also be sliding perpendicularly to the rolling motion (think of a car tire negotiating a curve when the car is traveling to fast -- lateral road friction is too small to impart sufficient centripetal force and the rolling tire slides sideways).

Technically, air friction will also operate on the moving disk...
 

FAQ: Can Sliding Friction Affect a Rolling Disk?

What is a rotational conceptual problem?

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