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Question 5445
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Laws of Motion: Advanced Newton's Laws MCQ

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Advanced Newton's LawsHardQuestion 5445

Question

A body moves up an incline (angle θ) with deceleration a. The coefficient of kinetic friction μₖ is:
  1. A
    (a−g sinθ)/(g cosθ)
    Correct
  2. B
    (a+g sinθ)/(g cosθ)
  3. C
    (g sinθ − a)/(g cosθ)
  4. D
    g cosθ/(a+g sinθ)

Correct answer

(a−g sinθ)/(g cosθ)

Explanation

Going up: net deceleration a = g sinθ + μₖg cosθ. So μₖ = (a−g sinθ)/(g cosθ).

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