Q-when do we say a body has energy ?
A-If a body can do work , then we say that the body has energy .
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Answer:
Work changes the amount of mechanical and internal energy possessed by objects. When work is done on a system or object, energy is added to it. When work is done by a system or object, it gives some of its energy to something else. Throwing a ball means a hand applies a force as an arm swings forward.
Explanation:
Work done by a force is positive if the applied force has a component in the direction of the displacement. Also, if the force acts perpendicular to the direction of motion, or if the displacement of the object is zero, then work done is zero.
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