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Q:

How does friction affect an airplane?

A:

An airplane is subject to a specific kind of friction, which we call friction drag. Friction drag is the resistance of the air along the surface of the plane. The air molecules rub along the plane and actually slow it down. To minimize the effects of drag, the airplane needs to be designed in such a way as to limit the surface and create a smooth trailing edge. We call these shapes streamlined or aerodynamic. 

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