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JAMB Physics 1993 Question 11

Question 11

Equilibrium of Forces

In the figure above the weight X is held in position by pulling the rope KLM in the direction LM. Which of the following diagrams shows the force acting at point L?

Diagram for this question
  1. A.Diagram A
  2. B.Diagram B
  3. C.Diagram C
  4. D.Diagram D
Show the answer and explanation

Answer: B (Diagram B)

Explanation

Three forces act at L: the weight (down), the pull along LM (horizontal) and the tension along LK (up and to the left). Drawn head to tail they close a triangle with a vertical side, a horizontal side and a slanting side, as in diagram B.