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Draw the direction of frictionn force in...

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

A

a ring

B

a disc

C

a solid

D

a hollow sphere

Text Solution

Verified by Experts

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.
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