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JAMB Physics 2009 Question 11

Question 11

Friction

An object of mass 80 kg is pulled on a horizontal rough ground by a force of 500 N. Find the coefficient of static friction. [g ≈ 10 ms−2]

  1. A.0.8.
  2. B.0.4.
  3. C.1.0.
  4. D.0.6.
Show the answer and explanation

Answer: D (0.6.)

Explanation

Taking 500 N as the force needed to overcome friction, μ = F/R = 500 ÷ (80 × 10) = 0.625 ≈ 0.6.