The short answer is: Newtons Third Law of Motion.
Many people intuitively think a rocket works like a person swimmingpushing against the water to move forward. However, in space, there is no medium (like air or water) to push against. Instead, a rocket relies on the conservation of momentum.
- Action and Reaction: Inside the rockets combustion chamber, fuel and oxidizer burn to create high-pressure gas. The engine nozzles accelerate this gas backward at incredible speeds.
- The “Push”: According to Newtons Third Law, for every action, there is an equal and opposite reaction. The force required to throw that exhaust mass out the back creates an equal force (thrust) pushing the rocket forward.
- The Momentum Balance: Think of it like standing on a skateboard with a heavy medicine ball. If you throw the ball away from you as hard as you can, you will roll in the opposite direction. You didn’t need to push against a wall; you just needed to throw mass away from yourself.
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