Here's a breakdown:
1. Combustion: Fuel and oxidizer are burned within the rocket engine's combustion chamber.
2. Expansion: The burning process creates extremely hot, high-pressure gases. These gases expand rapidly, pushing against the walls of the combustion chamber.
3. Nozzle: The expanding gases are directed through a specially shaped nozzle, which converts the pressure energy into kinetic energy (motion).
4. Action Force: The gases, expelled at high velocity from the nozzle, exert a force in the opposite direction to the rocket's motion. This is the action force.
According to Newton's Third Law of Motion, for every action, there is an equal and opposite reaction. The reaction force, in this case, is the thrust that propels the rocket upwards.
Therefore, the action force in a rocket launch is the force of the hot gases pushing out of the nozzle, and the reaction force is the thrust that propels the rocket.
