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Question

A round shaped body is released on an inclined plane. Friction is sufficient for pure rolling, mass of body is m & it is released from a height "h". Then which of the following is correct?

A
Work done by friction is negative
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B
At bottom total weight is less than mgh
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C
Total K.E. on the ground is mgh & ratio of KEtrans & KErotative depends upon shape of the body
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D
None of the above
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Solution

The correct option is C Total K.E. on the ground is mgh & ratio of KEtrans & KErotative depends upon shape of the body
Since no slipping, Wfriction=0 & total mechanical energy is conserved. So, it is equal to intial P.E. which is mgh. This distributes between rotational and translational K.E.

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