System of Particles and Rotational Motion - Result Question 79

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

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(a) dissipates energy as heat

(b) decreases the rotational motion

(c) decreases the rotational and translational motion

(d) converts translational energy to rotational energy

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Answer:

Correct Answer: 85. (d)

Solution:

  1. (d) Net work done by frictional force when drum rolls down without slipping is zero.

Wnet =0

i.e., converts translation energy to rotational energy.



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