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State Newton's law of viscosity of fluid...

State Newton's law of viscosity of fluids in motion.

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Viscous drag force .F. is directly proportional to the area of cross section (A) of the layer and inversely proportional to the velocity gradient. `i.e., F=-etaA((dv)/(dx))` where .n. is coefficient of viscosity of fluids. The -ve sign indicates that the frictional force opposes the flow.
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