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Question 30288
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Laws of Motion and Friction: Advanced — Friction Conceptual MCQ

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Advanced — Friction ConceptualHardQuestion 30288

Question

A rope of mass m and length L is on a rough table (μ). If a length (1/3)L hangs over the edge and the rope is on the verge of sliding, μ equals:
  1. A
    1/3
  2. B
    1/2
    Correct
  3. C
    2/3
  4. D
    1/4

Correct answer

1/2

Explanation

On-table mass = 2m/3. Hanging mass = m/3. At verge: friction = weight of hanging part. μ×(2m/3)g = (m/3)g. μ = (m/3)/(2m/3) = 1/2.

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