Four main flight forces:
Weight: Weight is the force of gravity. It acts in a downward direction—toward the center of the Earth.
Lift: 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.
Thrust: Thrust is the force that propels a flying machine in the direction of motion. Engines produce thrust.
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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| Four main flight forces of an airfoil |
