The Four Forces of Flight

Richard

Force 1 : Weight

Weight is the force of gravity. It acts in a downward direction,toward the center of the Earth. Weight is the force caused by gravity

Drag

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Force 2 : Drag

Drag is the force that acts opposite to the direction of motion. Drag is caused by friction and differences in air pressure. Drag is the force that acts opposite to the direction of motion.
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Force 3 :Thrust

Thrust is the force that propels a flying machine in the direction of motion. Engines produce thrust.Thrust is a force that moves an aircraft in the direction of the motion. It is created with a propeller, jet engine, or rocket. Air is pulled in and then pushed out in an opposite direction.
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Force 4 : 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. Lift is the force that keeps the air plane in the air.
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