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A door is pushed with a force of 50 N at a point 0.8 m from the hinges. What is the moment of the force about the hinges?
A62.5 N m
B50.8 N m
C40 N m
D16 N m
Answer & Solution
Correct answer: C. 40 N m
1. Moment of force M = F x d.
2. Substitute: M = 50 x 0.8.
3. M = 40 N m.
4. Rule out 62.5 N m: that wrongly divides F by d instead of multiplying.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 1 "Laws of Motion", p.19_
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