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Newton's third law states that every action has an equal and opposite reaction. In planes, this is embodied by the combustion of fuel in a jet engine. As it exits the engine under pressure it has momentum - the oppsite action is the plane moving forward. Bernoulli's principle involves the idea that faster moving air has a lower pressure and that the converse is true. The shape of wings and propellors creates a faster flow over one surface compared to the other; this creates a pressure differential and pushes/pulls the the wing/propellor in the desired direction (forward or up).

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Q: How do Bernoulli's principle and Newton's third law explain how an airplane can fly?
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