May the force be with you. What is NOT one of the four forces acting on a flying aircraft?

Whether you feel it or not, forces are acting on our bodies at all times. As for a body as big as an aircraft, those forces are even more forceful. The four forces of flight include weight, lift, thrust, and drag. When an airplane is flying level at a constant velocity, thrust is equivalent to drag and weight is equivalent to lift. The equilibrium of all these forces is a balancing act high in the sky.

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