Definition of Fluid friction
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Fluid friction Definition from Encyclopedia Dictionaries & Glossaries
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In fluid dynamics, drag (sometimes called air resistance, a type of friction, or fluid resistance, another type of friction) refers to forces acting opposite to the relative motion of any object moving with respect to a surrounding fluid. This can exist between two fluid layers (or surfaces) or a fluid and a solid surface. Unlike other resistive forces, such as dry friction, which are nearly independent of velocity, drag forces depend on velocity.
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