The Four Forces of Flight
FOUR FORCes FFECTING THINGS THAT FLY
1.
What is a force?
A force is basically a push or a pull that causes an object to undergo a change in speed, a change in direction, or a change in shape. A force has both magnitude (size) and direction.
Weight is the force of gravity. It acts in a downward
direction—toward the center of the Earth.
2.
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.
3.
Thrust is the force that propels a flying machine in the
direction of motion. Engines produce thrust.
4.
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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