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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 motion
4. converts translational energy to rotational energy

Correct answer: converts translational energy to rotational energy

Solution

When a drum rolls without slipping, the frictional force at the point of contact does no work and instead facilitates the conversion of translational kinetic energy into rotational kinetic energy, ensuring rolling motion.

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