The Four Forces of Flight

By: Abbi Enns

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Weight

Weight is the force of gravity. It acts in a downward direction-toward the center of the earth. Weight opposes lift.
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Lift

Lift opposes weight. Lift is a 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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Thrust

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

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