Answer:
Work
is said to be done by a force acting on the object when the object is displaced
along the direction of force. For example,
(i) A girl pulls a trolley and the
trolley moves through a distance. The girl has exerted a force on the trolley
and it is displaced along the direction of force. Therefore, work is done.
(ii) Lift a book through a height. To do this, you must apply a force.
The book rises up. There is a force applied on the book and the book has moved
up in the direction of force. Hence, work is done.
Thus, following two conditions need to be satisfied for
work to be done:
(i) a force should act on an object, and
(ii) the object must be displaced along the direction of
force.
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