Q.

A drum of radius R and mass M rolls down without slipping along an incline plane of angle θ. The frictional force

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a

dissipates energy as heat

b

describes the rotational motion

c

decreases the rotational and translational motion

d

converts translational energy to rotational energy

answer is D.

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Detailed Solution

The net work done by fictional force when drum rolls down without slipping is zero. ThereforeWnet =0or ,Wtrans +Wrot =0or, ΔKtrans +ΔKrot =0ΔKtrans =−ΔKrot Thus, the frictional force converts the translation energy to rotational energy
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A drum of radius R and mass M rolls down without slipping along an incline plane of angle θ. The frictional force