Automotive Aerodynamics
A car's profile is much like that of a wing, which causes lift. Different pressures are acting on the car as the air flows over it as indicated by the arrows (vectors,) which are normal (perpendicular) to the body's surface. When all of the pressure forces acting on the body of the car are added together, the net result will be more force pushing the car up (lift), and more force pulling the car back (drag).
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