Can a body possess energy even when it is not in motion? Explain your answer with an example.

Name the type of energy (kinetic or potential) possessed by the following:

(i) A moving cricket ball.

(ii) A stone at rest on the top of a building.

(iii) A compressed spring.

(iv) A moving bus.

(v) A bullet fired from a gun.

(vi) Water flowing in a river.

(vii) A stretched rubber band.

State the energy changes that occur in the following:

(i) The unwinding of a watch spring.

(ii) Burning coal while operating a steam engine

(iii) Lighting of a torch bulb.

(iv) An electric generator (or dynamo).

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.