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Question
(i) What do you understand by the term couple of forces?
(ii) Calculate the moment of a couple shown in fig.
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Solution
(i) Two equal and opposite parallel forces acting along different lines on a body constitute a couple.
(ii) Moment of couple = either force x perpendicular distance
= 4 x 10
= 40 Nm
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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.
