1. Thrust: This is the force that propels the rocket upwards. It's generated by the engine burning fuel and expelling hot gas out the nozzle.

2. Gravity: This is the force that pulls the rocket downwards towards Earth.

3. Drag: This is the force of resistance from the air as the rocket moves through it. It acts opposite to the direction of motion.

4. Lift: This force is generated by the shape of the rocket and the angle of attack (the angle between the rocket's nose and the direction of motion). It acts perpendicular to the direction of motion.

Note: Lift is usually less significant for rockets compared to aircraft, but it can still play a role in stabilizing the rocket and controlling its trajectory.