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Rotational Motion question

2005 · Q161
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Rotational Motion question

2005 · Q161

NEETPhysicsRotational MotionMCQ+4 / −1
A drum of radius R and mass M, rolls down without slipping along an inclined plane of angle θ\thetaθ. The frictional force
  1. A
    dissipates energy as heat
  2. B
    decreases the rotational motion
  3. C
    decreases the rotational and translation motion
  4. D
    converts translational energy to rotational energy.
View written solutionFree

Correct answer: D

It is noted that net work done by frictional force when drum rolls down without slipping is zero, so Wnet = 0

Wtrans + Wrotational = 0

ΔKtrans + ΔKrotational = 0

ΔKtrans = – ΔKrotational

Hence, frictional force converts translational energy to rotational energy.

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