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In fluid dynamics, the drag coefficient (commonly denoted as: , or ) is a dimensionless quantity that is used to quantify the drag or resistance of an object in a fluid environment, such as air or water.
For aircraft, pressure and friction drag are included in the definition of parasitic drag. Parasite drag is often expressed in terms of a hypothetical. Parasitic drag experienced by aircraft. This is the area of a flat plate perpendicular to the flow.
The force on an object that resists its motion through a fluid is called drag. When the fluid is a gas like air, it is called aerodynamic drag or air resistance . When the fluid is a liquid like water it is called hydrodynamic drag, but never "water resistance".
For most large objects such as bicyclists, cars, and baseballs not moving too slowly, the magnitude of the drag force \(F_D\) is found to be proportional to the square of the speed of the object. We can write this relationship mathematically as \(F_D\propto v^2 \).
For most large objects such as cyclists, cars, and baseballs not moving too slowly, the magnitude of the drag force F D F D is proportional to the square of the speed of the object. We can write this relationship mathematically as F D ∝ v 2 .
Air friction, or air drag, is an example of fluid friction. Unlike the standard model of surface friction , such friction forces are velocity dependent. The velocity dependence may be very complicated, and only special cases can be treated analytically.
Drag. Aerodynamic drag, sometimes called wind resistance, is an effect which a vehicle must overcome more and more as speed increases. Drag is a form of friction, though some of the air's effect on the vehicle is due to a low pressure zone behind the vehicle, and a high pressure zone in front.
