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In the diagram above, MN is perpendicular to ON and MP. What is the difference between...

Physics
JAMB 1980

In the diagram above, 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?

  • A. Zero
  • B. 0.2N.m
  • C. 0.4N.m
  • D. 0.8N.m
  • E. 0.6N.m
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Correct Answer: Option A
Explanation

Given:  Force \( P = 20 \, \text{N} \), Distance \( MN = 0.4 \, \text{m} \)
Moment About Point N: \(\text{Moment}_N = P \times MN = 20 \, \text{N} \times 0.4 \, \text{m} = 8 \, \text{Nm}\)

Moment About Point O: \(\text{Distance from O} = 0.5 \times \cos(36.87^\circ) \approx 0.4 \, \text{m}\)
\(\text{Moment}_O = P \times \text{Distance from O} = 20 \, \text{N} \times 0.4 \, \text{m} = 8 \, \text{Nm}\)

Difference Between Moments: \(\text{Difference} = \text{Moment}_N - \text{Moment}_O = 8 \, \text{Nm} - 8 \, \text{Nm} = 0 \, \text{Nm}\)


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