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JAMB Physics 1990 Question 7

Question 7

Equilibrium of Forces

Which of the following statements are correct about an object in equilibrium under parallel forces? I. The total clockwise moments of the forces about any point equals the total anticlockwise moments about the same point. II. The total forces in one direction equals the total forces in the opposite direction III. The resolved components along the x-axis equals the resolved components along the y-axis.

  1. A.I and II only
  2. B.I and III only
  3. C.II and III only
  4. D.I, II and III
Show the answer and explanation

Answer: A (I and II only)

Explanation

For equilibrium the moments balance about any point and the forces in opposite directions balance. There is no rule that x-components must equal y-components.