Take your hand and draw it through water in a pool. You can feel resistance---this is hydrodynamic drag. It is the effective force created by the interaction of your body and the water. Swimmers push ...

STOL Drag racing involves two airplanes racing side-by-side, taking off, flying 2,000 feet, landing, stopping, turning around, and repeating the process. Success depends on maximizing acceleration, ...

Piling up: this image shows water flowing from left to right past a partially submerged sphere. A pile up of water is clearly seen to the immediate left of the sphere. (Courtesy: Harris Lab) ...

For a solid object moving through a fluid or gas, drag is the sum of all the aerodynamic or hydrodynamic forces in the direction of the external fluid flow. It therefore acts to oppose the motion of ...

In fluid dynamics, drag (sometimes called air resistance or fluid resistance) refers to forces which act on a solid object in the direction of the relative fluid flow velocity. Unlike other resistive ...