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JAMB Physics 1988 Question 12

Question 12

Friction

A force, 10 N, drags a mass 10 kg on a horizontal table with an acceleration of 0.2 m s−2. If the acceleration due to gravity is 10 m s−2, the coefficient of friction between the moving mass and the table is

  1. A.0.02
  2. B.0.08
  3. C.0.20
  4. D.0.80.
Show the answer and explanation

Answer: B (0.08)

Explanation

Net force = 10 × 0.2 = 2 N, so friction = 10 − 2 = 8 N. μ = 8/(10 × 10) = 0.08.