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JEE Physics · Medium

Work, Power and Energy: Work by Friction MCQ

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Work by FrictionMediumQuestion 30413

Question

A block slides 4 m on a rough surface (μₖ = 0.3, m = 5 kg, g = 10 m/s²). Work done by friction is:
  1. A
    60 J
  2. B
    −60 J
    Correct
  3. C
    120 J
  4. D
    −120 J

Correct answer

−60 J

Explanation

Friction force = μₖmg = 0.3×5×10 = 15 N. W_friction = −15×4 = −60 J (negative since friction opposes motion).

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