The 4 Forces of Flight

Lift, Drag, Weight, Thrust


  1. Thrust is the force that propels a flying machine in the direction of motion. Engines produce thrust.


  1. Lift is the force that acts at a right angle to the direction of motion through the air. Lift is created by differences in air pressure.

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  1. Drag is the force that acts opposite to the direction of motion. Drag is caused by friction and differences in air pressure.


  1. Weight is the force of gravity. It acts in a downward direction—toward the center of the Earth.
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