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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.
Equations for surface force 
Surface force due to pressure 
f = Force, p = pressure, A = cross sectional area of the moving fluid
Pressure is in
Area is a
Given a pressure of and an area of find the surface force due to pressure.
See also 
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