Drag is a mechanical force acting opposite to the relative motion of any object moving with respect to a surrounding fluid.The drag which is responsable for the redution of the object's speed can exist between two fluid layers (or surfaces) or a fluid and a solid surface, the drag is generated by the diference of presure, which, in the case of an airplane, is generated by the diference in the velocity between the fluid and the solid object. Unlike other resistive forces, such as dry friction, which are nearly independent of velocity, drag forces depend on velocity. Drag force is proportional to the velocity for a laminar flow and the squared velocity for a turbulent flow. Even though the ultimate cause of a drag is viscous friction, the turbulent drag is independent of viscosity. The drag is a mechanical force that is generated by the diference of presure, which, in the case of an airplane, is generated by the diference in the velocity between the fluid and the solid object.
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