Drag (physics)
Retarding force on a body moving in a fluid / From Wikipedia, the free encyclopedia
Dear Wikiwand AI, let's keep it short by simply answering these key questions:
Can you list the top facts and stats about Drag (aerodynamics)?
Summarize this article for a 10 years old
In fluid dynamics, drag (sometimes called fluid resistance) is a force acting opposite to the relative motion of any object moving with respect to a surrounding fluid.[1] This can exist between two fluid layers (or surfaces) or between a fluid and a solid surface.
Unlike other resistive forces, such as dry friction, which are nearly independent of velocity, the drag force depends on velocity.[2][3] Drag force is proportional to the velocity for low-speed flow and the squared velocity for high speed flow, where the distinction between low and high speed is measured by the Reynolds number.
Drag forces always tend to decrease fluid velocity relative to the solid object in the fluid's path.