Define force. State its S.I. unit.
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Force is that cause which changes the state of the body (either the state of rest or the state of motion) or changes the size or shape of the body. The S.I. unit of force is newton (N).
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State two effects of a force when applied on a body.
Define the term moment of force.
How does the effect of a force differ when it is applied on
(a) a rigid body
(b) a non-rigid body?
State the effect of force F in each of the following diagrams (a) and (b).
