State the law of conservation of momentum. How does conservation of momentum take place in each of the following?

(i) A rocket taking off from ground.

(ii) Flying of a jet aeroplane.

Ans. Law of conservation of momentum :

It states that in an isolated system the net momentum of the system remains conserved.

(i) The chemicals inside the rocket burn and produce high velocity blast of hot gases, these gases pass through the tail nozzle of rocket in the downward direction with high velocity and the rocket moves up.

(ii) In jet aeroplanes, a large volume of gases produced by the combustion of fuel is allowed to escape through a jet in the backward direction. Due to high velocity, the backward rushing gases exert a forward force on the aeroplane.

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