Explain how expansion of a fluid being propelled from the space vehicle is related to Newton’s Laws. The propulsion of the cold gas system pushes the aircraft which relates to Newton's Third Law, for every action there is an equal and opposite reaction. Explain how life span of the vehicle is dependent on the amount of fuel it has and how quickly it is used. The less pressure there is in the containment tank, the less powerful the thrust. If you are low on pressure and fuel you will just get stuck and won't be able to move. The fuel is just used for the attitude controls.