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Circular Motion: Advanced — Coin on Turntable MCQ

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Advanced — Coin on TurntableHardQuestion 30678

Question

A coin is placed at the edge (r = 0.5 m) of a turntable that gradually increases from 0 to ω. The coin starts to slide when:
  1. A
    ω = √(μg/r)
  2. B
    ω > √(μg/r)
    Correct
  3. C
    ω < μg/r
  4. D
    ω = μg/r

Correct answer

ω > √(μg/r)

Explanation

Coin slides when centripetal force needed > maximum static friction: mω²r > μmg → ω > √(μg/r).

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