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Question 30223
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Laws of Motion and Friction: Inclined Plane — Friction MCQ

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Inclined Plane — FrictionMediumQuestion 30223

Question

A 10 kg block on an incline (θ = 30°) has μₖ = 0.3. It slides down. The acceleration is: (g = 10 m/s²)
  1. A
    2.4 m/s²
    Correct
  2. B
    5 m/s²
  3. C
    3.4 m/s²
  4. D
    2 m/s²

Correct answer

2.4 m/s²

Explanation

a = g(sinθ − μₖcosθ) = 10(sin30° − 0.3×cos30°) = 10(0.5 − 0.3×0.866) = 10(0.5 − 0.26) = 2.4 m/s².

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