In science, work is said to be done when there is a displacement in the position of the object in the direction of applied force. Two conditions that need to be satisfied for work to be done are that a force should act on an object and the object must be displaced. Mathematically, work done on an object is defined as the product of applied force and displacement of the body in the direction of force. The S.I. unit of work is Joule or N-m. The force acting on an object has different relations with the direction of displacement of the object. Their directions may be same, opposite or perpendicular to each other. It decides whether the work done by a force is positive, negative or zero. The total work done against gravity to lift an object above the earth’s surface can be given as the product of weight of the object and the height to which it was raised. Work done in a circular motion comes out to be zero as the two forces that act on an object in circular motion, tangential and centripetal forces, do no work on the object.

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