<human>:  Can you explain the physics behind launching a rocket?
<bot>: To launch a rocket, a large amount of energy is required in order to overcome the force of gravity and lift the rocket off the ground. The thrust force that is generated by the propulsion system is what drives the rocket into the sky and out of the Earth's atmosphere. When the fuel is ignited, the hot exhaust gases are directed through a nozzle which accelerates the exhaust gases and creates a high-pressure area that runs through the nozzle and creates a thrust force. This force is greater than the gravitational pull and is what accelerates the rocket upward. Once the rocket reaches an altitude where there is less air resistance, the engines are shut off and the rocket coasts until it reaches its intended destination.