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Question 30454
JEE Physics · Medium

Work, Power and Energy: Work — Friction on Incline MCQ

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Work — Friction on InclineMediumQuestion 30454

Question

A block pushed up a rough incline (θ=30°, μₖ=0.3, d=5m, m=2kg). Work done by friction is: (g=10, sin30°=0.5, cos30°=0.866)
  1. A
    −25.98 J
    Correct
  2. B
    +25.98 J
  3. C
    −15 J
  4. D
    +15 J

Correct answer

−25.98 J

Explanation

Normal force = mg cosθ = 2×10×0.866 = 17.32 N. Friction = μₖN = 0.3×17.32 = 5.196 N. W_friction = −5.196×5 = −25.98 J (opposing upward motion).

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