Rockets & Missiles
A rocket uses the kinetic energy from a burning propellant. When the fuse is lighted, it ignites the propellant which starts burning very quickly and produces gas. The gasses from the reaction are compressed inside of the rocket and can only come out of the nozzle. If the nozzle size is too small, the gases will build up to a dangerous critical level and will CATO (Catastrophy at take off). If the nozzle size is just correct, the gases will rush out with such pressure, that the rocket will fly upwards. A rocket uses a stick as a stabilizer (to ensure that it goes straight up) and a missile uses fins. Without these, the rocket would not go straight up. Rockets use a nose cone to increase aerodynamics and can also have a "header" which is the word for the load of stars / effects in the top.