1. Thrust: This is the force generated by the rocket engines, pushing the rocket upwards. It's the driving force of the launch, generated by the rapid expulsion of hot gases from the engines.
2. Gravity: This is the force pulling the rocket downwards, towards the Earth's center. It's the force the rocket needs to overcome to achieve liftoff and reach orbit.
These two forces are constantly in opposition during liftoff. The rocket needs to generate enough thrust to exceed the force of gravity, allowing it to accelerate upwards.
