From Deseret News archives:
Four forces of aerodynamics
Gravity: Gravity pulls the plane down toward the Earth.
Thrust: The engine pushes the plane forward through the air.
Drag: The air rubbing against a plane as it flies slows it down.
Lift and drag work opposite each other top to bottom, just as thrust and drag work against each other front to back.
Source: "The Kids' Paper Air Plane Book," by Ken Blackburn and Jeffrey Lammers, Workman Publishing
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