1. Thrust: This is the force that propels the rocket upwards. It is generated by the burning of fuel, which creates hot gas that is expelled out of the rocket's nozzle.
2. Gravity: This is the force that pulls the rocket back down towards Earth.
3. Drag: This is the force that opposes the rocket's motion through the air. It is caused by the friction between the rocket's surface and the air molecules.
4. Lift: This is the force that helps to keep the rocket stable and pointing in the right direction. It is generated by the shape of the rocket and the way it interacts with the air.
These four forces are constantly acting on a rocket. The thrust must be greater than the gravity and drag for the rocket to lift off. Once the rocket is in flight, the lift helps to keep it from falling over.
