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Wikipedia defines work as:
Another question is from that wikipedia:
What if in space,where there is no external force acting,Someone applies a force and the object will move on to a infinite displacement forever(Newton's first law).Is work done?In physics, a force is said to do work when it acts on a body so that there is a displacement of the point of application, however small, in the direction of the force. Thus a force does work when it results in movement.
Another question is from that wikipedia:
Work done=Energy transferred . That means in circular motion no energy is transferred to the object ,not even kinetic.Then how can it move?For example, the centripetal force exerted inwards by a string on a ball in uniform circular motion sideways constrains the ball to circular motion restricting its movement away from the center of the circle. This force does zero work because it is perpendicular to the velocity of the ball.