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JAMB Physics 2012 Question 13

Question 13

Friction

An object of mass 20kg slides down an inclined plane at an angle of 30° to the horizontal. The coefficient of static friction is [g ≈ 10ms−2]

  1. A.0.2
  2. B.0.3
  3. C.0.5
  4. D.0.6.
Show the answer and explanation

Answer: D (0.6.)

Explanation

Taking the object as just starting to slide, μ = tan 30° ≈ 0.58, which is about 0.6.