A good example of newtons laws of motion. Law numero uno:a body in motion tends to stay in motion,a body at rest tends to stay at rest.-when it's sitting on the ground you have to use a lot of compressed air to make it go up Law numero dos:force = mass X acceleration-if a rocket is really heavy it won't work very well. Law numero tres:for every action there is a equal but opposite reaction- the water coming out of the bottom is the action,the reaction is the rocket going up. (: :)***(: :)