Question

1. In a rocket, a large volume of gases produced by the combustion of fuel is allowed to escape through

its tail nozzle in the downward direction with the tremendous speed and makes the rocket to move

upward.

Which principle is followed in this take-off of the rocket?

(a) Moment of inertia (b) Conservation of momentum

(c) Newton’s third law of motion (d) Newton’s law of gravitation​

Answer 1

Its due to

(b) conservation of momentum

the gases when produced out with a high speed downwards, the momentum (ie. mass × velocity ) changes . In order to conserve the momentum of the whole system, the rocket moves upwards with the same velocity.

Conservation of momentum is actually based on Newton's Third Law of Motion where the action of gases downward receives equal reaction by the movement of the rocket upwards.

hope you understood it!