Friction is force acted on the boundary surface a body when it want to get a relative velocity w.r.t another body contacted by that boundary surface.
Friction F = μN where N is the Normal Reaction.
Similarly for fluid the viscosity is applied on a surface of the fluid by another surface.
Friction F = μN where N is the Normal Reaction.
Similarly for fluid the viscosity is applied on a surface of the fluid by another surface.
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