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A solid uniform disc of mass m rolls wit...

A solid uniform disc of mass `m` rolls without slipping down a fixed inclined plank with an acceleration a. The frictional force on the disc due to surface of the plane is

A

2ma

B

`3/2 ma`

C

ma

D

`1/2 ma`

Text Solution

Verified by Experts

The correct Answer is:
D
For rotational motion, only friction is there which will exert a clockwise torque on it as torque of Mg and N will be zero.
`fr=Ialpha = fr=(mr^(2))/2 xx a/r rArr f=(ma)/2`
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