Newton's third law of motion is in effect here. The liquid or gas rushing out the back is an action force. The rocket propelling up is a reaction force.
newtons law of motion
Force= Mass x Acceleration
Almost all machinery uses the 2nd Law. Also sports activity and firearms use the 2nd law. The 2nd Law runs the Universe, from the motions of tools to the motions of the galaxies.
-- There are two other laws in the set ... one before it and one after.
newtons third law
Newton's Third Law. Equivalent to Conservation of Momentum. By Newton's Third Law, if the gas is pushed out of the rocket, the gas pushes the rocket back, in the opposite direction.
the principle behind working of a rocket is newtons 3rd law of motion which states that every action has equal and opposite reaction
For every action, there is an equal and opposite reaction (Newton's third law of motion)..
The achievement of lifting a rocket off the ground and into space can be explained by Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. This law explains how the rocket engines generate thrust by expelling gases downward, causing the rocket to move upward.
The products of the burning fuel are ejected from the rocket at high velocity. In accordance with Newton 's Third Law, this action generates an equal and opposite reaction on the rocket. The forward forward force acting on the rocket accelerates it.
An ice skater gliding across the ice A person diving into a pool A rocket launching into space
Its a matter of being scientifically rigorous. You can not claim the 2nd law as a law unless you first establish the first law.