Surface force
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 in to two perpendicular components: pressure and stress forces. Pressure force acts normally over an area and stress force acts tangentially over an area.
Contents
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 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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