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JAMB Physics 1997 Question 10

Question 10

Friction

The figure above shows a block of mass m sliding down a rough inclined plane QP at angle θ. The forces acting on the block along the plane QP are

Diagram for this question
  1. A.mg sin θ and the normal reaction
  2. B.mg sin θ and the force of friction
  3. C.mg cos θ and the normal reaction
  4. D.mg cos θ and the force of friction
Show the answer and explanation

Answer: B (mg sin θ and the force of friction)

Explanation

Along the slope there is the component of weight mg sin θ pulling the block down and friction opposing its motion. The normal reaction and mg cos θ act at right angles to the slope.