Question

The principle of rocket propulsion depends on:
A. Newton’s third law of motion
B. Principle of conservation of momentum
C. Either A and B
D. Both A and B

Answer 1

Hint: In physics, the concept of work and energy is thoroughly correlated and linked to force. It is because whenever force is applied to any object, there is some work done and also some change in the energy. The properties of rocket propulsion should be compared with the principles at hand. If the principles are satisfied then dependence is created.

Complete step by step answer:

The principle of rocket propulsion works on the ‘Newton’s Third Law of Motion’. It states that for every action, there is an equal and opposite reaction’.
As far as the rocket is concerned, the engine of the rocket releases hot burning fuel in the downward direction. As a reaction, the gases apply equal and opposite force on the rocket in the upward direction.
This is how a rocket takes off from earth.
The principle of conservation of momentum states that when two bodies collide, momentum of the bodies before and after collision remains the same.
At stationary position, the momentum of the rocket and the gases is zero. After the fuel is ignited, the momentum of the rocket and the gases are equal and opposite to each other. So the total momentum is zero. Thus the principle is satisfied.
Both the principles impact the rocket propulsion.

Note:
Rocket propulsion is the system that uses different principles of physics to lift a rocket off the surface of earth. Solid propulsion takes place when the fuel and oxidizer are mixed as a solid. Liquid propulsion takes place when the fuel and oxidizer are stored separately as liquid, then later combined and ignited.