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Lift
Gravity
Thrust
Drag

Lift is the lifting force that allows airplanes to fly, gravity is the force pulling it back down.
Thrust is the force that propels an airplane forward, drag is the aerodynamic friction slowing it down.

These variables are constantly interacting with eachother, when an airplane is in straight and level flight, these forces are said to be in balance.

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What are the four forces of flight?

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