Question

Why is force exerted by static fluids always perpendicular to a surface?

Answer 1

At any point in the fluid the force due to pressure acts in all directions but once the fluid is in contact with asurface, the force is restricted to a particular direction. ... If the fluidmoves with respect to the surface, an additional force due to the shear stress acts along the surface.


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Answer 2

Answer:

Why is force exerted by static fluids always perpendicular to a surface?