A drum of radius R and mass M, rolls down without slipping along an inclined plane of angle θ. The frictional force (a) dissipates energy as heat (b) decreases the rotational motion (c) decreases the rotational and translation motion (d) converts translational energy to rotational energy.

Answer: (d). In rolling without slipping the contact point is at rest, so static friction does no work and dissipates no energy. Friction acts up the incline: it reduces the linear acceleration but gives a torque that increases the angular speed. So it converts part of the translational energy into rotational energy: answer (d).

A drum of radius R and mass M, rolls down without slipping along an… | NEET 2005 (AIPMT)

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Rolling Motion

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

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Answer: (d)

In rolling without slipping the contact point is at rest, so static friction does no work and dissipates no energy.
Friction acts up the incline: it reduces the linear acceleration but gives a torque that increases the angular speed.
So it converts part of the translational energy into rotational energy: answer (d).

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