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JAMB Physics 1994 Question 11

Question 11

Friction

Calculate the magnitude of the force required to just move a 20kg object along a horizontal surface if the coefficient of friction is 0.2 (g = 10 m s−2)

  1. A.400.0 N
  2. B.40.0 N
  3. C.4.0 N
  4. D.0.4 N
Show the answer and explanation

Answer: B (40.0 N)

Explanation

F = μR = μmg = 0.2 × 20 × 10 = 40.0 N.