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Question
Calculate the resultant moment of forces about O and state its direction in fig.
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Solution
In the given figure, forces 10 N and 100 N act clockwise and the forces 15 N and 4 N act anticlockwise
MOment of force = sum of clockwise moments - sum of anti clockwise moments
Moments of force = (10 x 5 + 100 x 0 + 4 x 6) - ( 15 x 4) = 74 - 60 = 14 Nm
or 14 Nm in clockwise direction.
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Assertion & Reasoning
- Assertion: The sum of the clockwise moments is equal to the sum of the anticlockwise moments.
- Reason: The principle of conservation of momentum is valid if the external force on the system is zero.
