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The Engine Cycle - An Application of Newton's 3rd Law

Steam is forced out and the boat moves forward..

As the steam bubble forms the pressure inside the boiler pan increases until a rush of hot water and steam are expelled through the jets. The boiler output is projects backwards, away from the boat. By Newton's Third Law we know that for every action there is an equal and opposite reaction. Therefore, the boat is forced forward as the hot water and steam go backward.
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