Question

(a) What do you understand by the term "transformation of energy"? Explain with an example.
(b) Explain the transformation of energy in the following cases:
(i) A ball is thrown upwards.
​(ii) A stone dropped from the roof of a building.

Answer 1

(a) The transformation of energy means the conversion of energy from one form to another. Example: Electric energy is converted into mechanical energy by an electric motor.

(b) (i) When a ball is thrown upwards, the kinetic energy of the ball gradually gets converted into potential energy and at the highest point, the whole of the kinetic energy transforms into potential energy of the ball.

(ii) A stone at the roof of the building has some potential energy. When it is dropped from the roof, the potential energy possessed by the stone starts transforming into kinetic energy and at the bottom, it becomes purely kinetic.