Draw the direction of frictionn force in the followign cases. If rolling object is

Options

A. a ring
B. a disc
C. a solid
D. a hollow sphere

Explanation

a. `K^(2)=R^(2)implies Rx=R R/2`
As `K^(2)gtRx,`
The frictio will act in the backward direction

b. `K^(2)=(R^(2))/2impliesRx=R R/2 =(R^(2))/2`
`impliesK^(2)=Rx`
no friction will act.
`K^(2)=2/5R^(2)implies Rx=R R/2=(R^(2))/2`
`impliesK^(2)ltRx`
The friction will act in the forward direction.
d. `K^(2)=2/3R^(2)implies Rx=R R/2 =(R^(2))/2`
`=Lgt K^(2)gtRx`
The friction will act in the forward direction.