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Air Friction. 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.
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. It is used in the drag equation in which a lower drag coefficient indicates the object will have less aerodynamic or hydrodynamic 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.
4 Μαρ 2017 · The forces that a moving vehicle must overcome are the tire rolling resistance, the driveline friction, elevation, vehicle acceleration changes, and also aerodynamics. Let us assume that the vehicle moves along a flat surface at a constant speed and the external forces are limited to the tire friction and to the aerodynamic drag.
21 Νοε 2022 · Since the air inside the tube is at a lower pressure than the air above it, the tube collapses until you stop blowing. Stated simply, Bernoulli's principle (pronounced Bur-noo-ee's) simply reminds us that the total energy in a moving fluid is constant.
31 Μαΐ 2014 · The easy answer is to point you to a Google image search for friction coefficient velocity. This finds lots of experimentally measured graphs of $\mu$ against sliding velocity and you'll see $\mu$ is indeed dependant on velocity and isn't a constant. Friction is an emergent property.
Friction caused by air is called air resistance or drag. Bikes, cars and other moving objects experience air resistance as they move through the air.
