Rigid Body Dynamics: Pure Rolling — Energy Loss MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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Pure Rolling — Energy LossHardQuestion 30333

Question

A disc rolling without slipping on a rough surface. The work done by friction on the disc is:

A
Positive
B
Negative
C
Zero
Correct
D
Depends on speed

Correct answer

Zero

Explanation

In pure rolling, the contact point is instantaneously at rest, so friction acts over zero displacement at that instant → work done by friction = 0. Energy is conserved in pure rolling.

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