Explain contact forces and field forces with example.
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It is our common experience that some 'muscular effort or force is required when we lift a bucket of water. A ball pressed by hands produces a change in the shape of the ball. To stop a moving body, some force is required. Thus, force is a push or pull which produces or tends to produce a change
in the state of rest or of uniform motion. Force may produce the following changes:
(i) It can change the speed of an object.
(ii) It can change the direction of motion of an object.
(iii) It can change the shape or size of an object.
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