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JAMB Physics 1985 Question 8

Question 8

Friction

A metal block of mass 5 kg lies on a rough horizontal platform. If a horizontal force of 8 N applied to the block through its centre of mass just slides the block on the platform, then the coefficient of limiting friction between the block and the platform is

  1. A.0.16
  2. B.0.63
  3. C.0.80
  4. D.1.60
  5. E.2.00
Show the answer and explanation

Answer: A (0.16)

Explanation

Limiting friction = μmg, so 8 = μ × 5 × 10 and μ = 0.16.