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Question 30468
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Work, Power and Energy: JEE — Non-conservative Work MCQ

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JEE — Non-conservative WorkHardQuestion 30468

Question

A block slides along a closed path (loop) on a rough surface. Work done by friction is:
  1. A
    Positive
  2. B
    Negative
    Correct
  3. C
    Zero
  4. D
    Depends on loop shape

Correct answer

Negative

Explanation

Friction always opposes motion, so friction always does negative work. Over a closed path, total work by friction < 0.

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