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JAMB Physics 1980 Question 31

Question 31

Equilibrium of Forces

In the above diagram MN is perpendicular to ON and MP. What is the difference between the moment about N of the force of 20 newtons applied along MP and its moment about O?

Diagram for this question
  1. A.Zero
  2. B.0.2 N m
  3. C.0.4 N m
  4. D.0.8 N m
  5. E.0.6 N m
Show the answer and explanation

Answer: A (Zero)

Explanation

MN = √(0.5² − 0.3²) = 0.4 m. The vertical 20 N force at M is 0.4 m (horizontally) from both N and O, so both moments are 20 × 0.4 = 8 N m and the difference is zero.