A drum of radius R and mass M, rolls down without slipping

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

1. dissipates energy as heat
2. decreases the rotational motion
3. decreases the rotational and translational translational motion
4. converts translational energy to rotational energy

Correct Option: D

Net work done by frictional force when drum rolls down without slipping is zero.
W_net = 0

W_trans. + W_rot. = 0; ∆K_trans. + ∆K_rot. = 0
∆K_trans = –∆K_rot.
i.e., converts translation energy to rotational energy.