relative motion

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The motion of one body relative to another. For a body moving in a fluid, it is the difference between the speed of the body and the speed of the fluid. When considering the influence of a fluid on the motion of a body, the relative motion is more important than the absolute speed of either the fluid or the body. Most studies find it convenient to consider the body to be at rest and the fluid to be moving past it.

Subjects: Sports and Exercise Medicine.

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