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JAMB Physics 2012 Question 3

Question 3

Friction

A load is pulled at a uniform speed along a horizontal floor by a rope at 45° to floor. If the force in the rope is 1500N, what is the frictional force on the load?

  1. A.1524N
  2. B.1350N
  3. C.1260N
  4. D.1061N.
Show the answer and explanation

Answer: D (1061N.)

Explanation

At uniform speed the horizontal pull equals the friction: F = 1500 cos 45° ≈ 1500 × 0.707 ≈ 1061 N.