JEE Main Physics question

A solid cylinder is rolling down a rough inclined plane of inclination . Then

(A)The friction force is dissipative
(B)The friction force is necessarily changing
(C)The friction force will convert translational energy to rotational energyCorrect
(D)The friction force is reduced if is reducedCorrect

Answer: (C),(D)

Solution

The static friction for pure rolling, , is nonzero and constant for a fixed (ruling out (B)), does no net work (not dissipative, ruling out (A)), decreases as

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Question ID VK-159145