The total force on a surface results from integrating what over the surface in fluid mechanics

For calculating the total force on a surface must integrate the fluid shear stress over the whole surface.

Explanation:

By definition, the total force from the fluid in the cartesian system of coordinates is defined as:

The shear stress can be calculated by applying the Navier-Stokes equations and also can be expressed in other coordinates systems like cylindrical or spherical coordinates system.

answer:

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