In airplane design all of these factors must be considered. In normal cruising flight all the forces acting on a plane must balance (see forces of flight). The lift provided by the wings must equal the aircraft's weight; the forward thrust of the engines must balance the forces of drag. Lift occurs because the wing's upper surface is more convex, and therefore longer, than the lower surface. Air must therefore travel faster past the upper surface than past the lower, which leads to reduced pressure above the wing.
Related terms include: (1) aerodynamic efficiency, which is the efficiency with which an airfoil uses the aerodynamic forces acting on it; in particular the ration of lift to drag; (2) aerodynamic heating, which is heating produced by friction when flying at high speed through an atmosphere; and (3) aerodynamic vehicle, which is a vehicle such as an airplane or glider capable of flight when moving through an atmosphere by generating aerodynamic forces.
Related category• AERODYNAMICS AND AERONAUTICS
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