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Rockets push against themselves they don't push against the air. That how they get there momentum. But I'll leave it up to these three guys. They explain it more in detail and its easy to understand.

Rockets don't get thrust by pushing against the air. Rockets get thrust by pushing against the rocket on one side and pushing against nothing on the other side of an explosion.

The rocket ejects a mass of burned fuel to produce a force. The force produced is proportional to the amount the mass of the combustion products (the exhaust) was accelerated. This follows from F=ma (Force = mass x acceleration)

So, the more you accelerate the exhaust, the more force is applied to the rocket.

Imagine you are floating in space. If you take off a shoe and throw it away from you really fast, you will move in the opposite direction from your shoe. You can even do this without going into space if you are standing on a very low friction surface like ice.

Also, the shape of the rocket exhaust nozzle is made or 'tuned' in such a way that it captures the expanding gasses escaping the combustion chamber of the rocket engine as efficiently as possible.

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10y ago

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