First slide

Rolling motion

Question

When a body rolls without sliding up an inclined plane, the frictional force is:

Moderate

A

directed up the plane
B

directed down the plane
C

zero
D

dependent on its velocity

Solution

Since the body rolls without sliding, So $a_{p} = 0, u_{p} = 0 and v = ωr, a = αr$ Since the body's acceleration a is downward parallel to the plane, therefore angular acceleration of the body must be in anticlockwise a sense. That means the friction must act up the plane to produce an anticlockwise torque to produce anticlockwise angular acceleration.

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