Surface force denoted fs is the force that acts across an internal or external surface element in a material body. Surface force can be decomposed into two perpendicular components: pressure and stress forces. Pressure force acts normally over an area and stress force acts tangentially over an area.
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Surface force due to pressure
f = Force, p = pressure, A = cross sectional area of the moving fluid
Pressure related surface force
Pressure is in
Area is a
Given a pressure of