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JEE Physics · Medium

Work, Power and Energy: Non-conservative Force MCQ

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Non-conservative ForceMediumQuestion 30420

Question

The work done by friction on a body moving along a closed path (returning to the starting point) is:
  1. A
    Zero
  2. B
    Positive
  3. C
    Negative
    Correct
  4. D
    Equal to ΔKE

Correct answer

Negative

Explanation

Friction always opposes motion, so work done by friction is always negative regardless of path direction. Over a closed path, total work by friction < 0 (it is non-conservative).

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