Surface force

Surface force denoted f_s 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_{s}=p\cdot A\

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

Examples

Pressure related surface force

Pressure is in ${\frac {force}{area}}={\mathrm {{\frac {N}{m^{2}}}}}$
Area is a $(length)\cdot (width)={\mathrm {m\cdot m}}={\mathrm {m^{2}}}$

Given a pressure of $5{\mathrm {{\frac {N}{m^{2}}}}}=5{\mathrm {Pa}}$ and an area of $20{\mathrm {m^{2}}}$ find the surface force due to pressure.

5{\mathrm {Pa}}\cdot 20{\mathrm {m^{2}}}=100{\mathrm {N}}

See also

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