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Thrust refers to the energy applied to pull the airplane forward through the air. The inverse being drag.

The 4 main forces working on an airplane in flight are.

1. Thrust (airplane engines pulling (or pushing) the aircraft forward)

2. Drag (aerodynamic friction slowing the aircraft down)

3. Lift (Rising force created by the wings which keeps the airplane aloft)

4. Gravity (pulling the aircraft back down to earth)

These forces interact with each other in various ways constantly throughout the flight.

Thrust is a reaction force described by Newton's second and third laws. Thrust applies to the flight of fix-wing aircraft, in pushing a plane forward, increasing the speed of air travelling over and under the wing surfaces creating lift.

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Q: What is thrust of an airplane?
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