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How do rockets work?
Quick answer
Rockets work by Newton's third law: they burn fuel to shoot hot gas out the back at high speed, and the equal and opposite reaction pushes the rocket forward. Unlike a jet, a rocket carries its own oxygen, so it can work even in the vacuum of space.
Step by step
- A rocket burns fuel with an oxidizer to produce a high-speed jet of exhaust gas.
- By Newton's third law, expelling gas backward pushes the rocket forward (thrust).
- It carries its own oxygen supply, so it works in space where there's no air.
- To reach orbit, a rocket must accelerate to about 28,000 km/h sideways, not just go straight up.
- Most use multiple stages, dropping empty fuel tanks to shed weight as they climb.
People also ask
How do rockets work in space with no air?
Rockets don't push against air — they push against their own expelled exhaust. They carry their own oxidizer to burn fuel, so they work fine in a vacuum.
What's the difference between a rocket and a jet engine?
A jet engine takes in air from the atmosphere to burn fuel; a rocket carries its own oxygen, so it can operate in space where a jet engine can't.
Why do rockets have stages?
Dropping empty tanks mid-flight sheds dead weight, so the remaining engines accelerate the lighter rocket more efficiently toward orbit.
What is thrust?
The forward force produced by expelling exhaust gas backward at high speed.
Why are rockets staged?
Dropping empty fuel tanks (stages) sheds dead weight, so the remaining rocket accelerates more efficiently.
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