Thrust is the force that propels a rocket or spacecraft and is measured in pounds, kilograms or Newtons. Thrust is generated by a high-speed jet of gases discharging through a nozzle.

We need to generate a lot of energy which creates thrust – this pushes the rocket up into the sky.

Watch this quick example of an octopus jet propulsion! This shows thrust in exactly the same way as a rocket.

Have you ever heard of Sir Isaac Newton? He established a universal law saying – “for every action, there is an equal and opposite re-action”.

In the Water Rokit our fuel is water, but a Space rocket needs a special, powerful rocket fuel. This fuel is either liquid (like the fuel in your car), or solid (like a firework).

A rocket is propelled forward by a thrust equal in magnitude, but opposite in direction, to the time-rate of momentum change of the exhaust gas accelerated from the combustion chamber through the rocket engine nozzle. This is the exhaust velocity with respect to the rocket, times the time-rate at which the mass is expelled.

Have a look at this video: Thrust: Rocket Engines (How Things Fly Demonstration)

And this one takes it a bit further: Rocket Thrust Explained