Energy can exist in several forms and may change from one form to another. Give two examples to show the conversion of energy from one form to another.

Give one relevant example for each of the following transformations of energy:

(i) Electrical energy to heat energy

(ii) Electrical energy to mechanical energy

(iii) Electrical energy to light energy

(iv) Chemical energy to heat energy

(v) Chemical energy to light energy

Give one example to show that the sum of potential energy and kinetic energy remains constant if friction is ignored.

A ball is made to fall freely from a height. State the kind/kinds of energy possessed by the ball when it is:

(a) at the highest point

(b) just in the middle

(c) at the ground.