At high elevations, the force of gravity becomes less.
Acceleration of a rocket is due to a non-contact force known as thrust. Thrust is generated by expelling mass from the rocket at high velocities, resulting in a reaction force that propels the rocket forward.
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A rocket is propelled by the force generated through the controlled burning of rocket fuel. As the fuel burns, it is expelled out of the rocket's engine at high speed, creating thrust in the opposite direction that propels the rocket forward due to Newton's third law of motion.
The propulsion force of a rocket is the force generated by expelling exhaust gases at high speeds through the rocket's engine nozzle. This force propels the rocket in the opposite direction, following Newton's third law of motion (action and reaction). It enables the rocket to overcome gravity and atmospheric resistance to launch and travel through space.
During a rocket launching, the action force is the thrust generated by the rocket engines expelling high-speed gases in the opposite direction of the desired motion. This thrust pushes the rocket upward by exerting a force on the ground, following Newton's third law of motion.
The force created by a rocket is called thrust. Thrust is generated by the expulsion of gas at high speed from the rocket's engines, following Newton's third law of motion: for every action, there is an equal and opposite reaction. This thrust propels the rocket upward against the force of gravity.
The combustion of rocket fuel ejects a mass of material at high velocity. In accordance with Newton's third law, the momentum of the ejecta generates an equal and opposite reaction - which propels the rocket forward.
The force that enables a rocket to accelerate upwards is the thrust generated by the engine as it expels high-speed exhaust gases downward. This action, in accordance with Newton's third law of motion, results in a reaction force pushing the rocket upwards.
It is not the action but the reaction force that makes a rocket lift up. The action force is the force released when the rocket fuel burns. This action force acts on the surface/ground and according to Newton's Third Law [For each and every action, there is an equal and opposite reaction], a reaction force acts towards the rocket hence giving it a lift.
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A rocket moves vertically upwards by expelling high-speed exhaust gases out of its engines, in accordance with Newton's third law of motion. This action generates a force in the opposite direction, propelling the rocket upwards against the force of gravity. The rate of acceleration is determined by the mass of the rocket and the force produced by the engine.
An acceleration is only possible if there is a force. In the case of a rocket, that may be gravitational forces acting on it, or it may be the reaction force of burning gases that come out of the rocket.