1. Thrust: Thrust is the force that propels the rocket upwards against gravity. It is generated by the rocket's engines, which expel high-speed exhaust gases. The greater the thrust produced by the engines, the faster the rocket can accelerate and lift off from the ground.
2. Gravity: Gravity is the force that pulls the rocket downwards towards the Earth's center. It is always present and acts in opposition to the thrust generated by the rocket's engines. The strength of gravity depends on the mass of the rocket and decreases with increasing distance from the Earth's surface.
During liftoff, the rocket's engines must produce enough thrust to overcome the force of gravity and lift the rocket upwards. The ratio between thrust and gravity determines whether the rocket can successfully take off. If the thrust is greater than gravity, the rocket will lift off, but if gravity is greater than the rocket's thrust, it won't be able to leave the ground.
