Question

Write law of conservation of energy and derive it ?

Answer 1

The law of conservation of energy states that energy can neither be created nor be destroyed. It may be transferred from one of its forms to the other. But the total energy of an isolated system always remains constant, if you take into account all forms of energy.




Proof for Law of Conservation of Energy:

Considering the potential energy at the surface of the earth to be zero.

At point A, the velocity of the ball is zero hence only potential energy is there.

 

E = mgH ———- (1)

At point B, the ball is falling freely under gravity so it will gain speed as it reaches point B so at this point it will have both kinetic and potential energy.

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