Surface force

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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[edit]

Surface force due to pressure[edit]

f = Force, p = pressure, A = cross sectional area of the moving fluid

Examples[edit]

Pressure related surface force[edit]

Pressure is in
Area is a

Given a pressure of and an area of find the surface force due to pressure.

See also[edit]