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The rocket's propellant shoots out of one of its ends. Newton said that every action (like rocket propellant shooting out) is accompanied by an equal (same force) but opposite re-action.

So, if the propellant shoots out with a force of, say, 1,000 pounds, then the rocket is pushed in the opposite direction (forward, we hope) by 1,000 pounds.

It works! Try standing on one tiptoe while holding a weight of 5 or 10 pounds out to your side. Move the weight quickly sideways across your body and you will find your body moving (twisting because of that toe on the floor) in the opposite direction.

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