Answer:
The reaction force is the upward push on the rocket engine by the gas mole- cules. This is the thrust that propels the rocket upward. ground on your foot is equal and opposite to the force of your foot on the ground. If you push back harder, the ground pushes forward harder.
Newton's third law states that every action has an equal and oposite reaction. You may not think this, but when you're standing ont he floor, you are excerting a force against the floor: your weight, caused by gravity, is pulling you down. The floor is reacting by pushing back: we call this force the reaction force.
Explanation:
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