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originally posted by: dragonridr
There are 3 basic principles that cause a rocket to produce thrust.
1.Objects at rest will stay at rest and objects in motion will stay in motion in a straight line unless acted upon by an unbalanced force.
2.Force is equal to mass times acceleration.
3.For every action there is always an opposite and equal reaction.
For a rocket in space newton's 3rd law comes into effect.The rocket pushes on the gas, and the gas in turn pushes on the rocket. Ironically rockets work better in space because they don't have the pressure of the atmosphere to slow down thrust.
The higher the velocity of the expanding gas the greater the thrust as it pushes against the rocket. To prevent a rocket from moving it must have considerably more mass than the pressure the expanding gas can create. For example I could take a co2 canister in space and it wouldnt be enough to move an astronaut noticeably. It would provide thrust just be so minor it would be difficult to tell. But now hook up 100 co2 canisters and I have this.
Next thing people will say is that man can actually go past the Van Allen radiation belt and live...
originally posted by: NicSign
a reply to: Alchemst7
Vacuum cleaner merely creates low pressure. Vacuum of space is extreme low pressure.