Surface force

 ( Classical Mechanics ) 

Surface force denoted f_s is the force that acts across an internal or external surface element in a material body. and between objects are types of surface force. All and between objects are considered as surface forces. Surface force can be decomposed into two perpendicular components: and . A normal force acts normally over an area and a shear force acts over an area.

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Equations for surface force

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Surface force due to pressure

$f\_s=p\; \backslash cdot\; A\; \backslash$, where f = force, p = pressure, and A = area on which a uniform pressure acts

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Examples

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Pressure related surface force Since pressure is $\backslash frac\{\backslash mathit\{force\}\}\{\backslash mathit\{area\}\}=\backslash mathrm\{\backslash frac\{N\}\{m^2\}\}$, and area is a $(length)\backslash cdot(width)\; =\; \backslash mathrm\{m\; \backslash cdot\; m\; \}=\; \backslash mathrm\{m^2\}$,

a pressure of $5\backslash \; \backslash mathrm\{\backslash frac\{N\}\{m^2\}\}\; =\; 5\backslash \; \backslash mathrm\{Pa\}$ over an area of $20\backslash \; \backslash mathrm\{m^2\}$ will produce a surface force of $(5\backslash \; \backslash mathrm\{Pa\})\; \backslash cdot\; (20\backslash \; \backslash mathrm\{m^2\})\; =\; 100\backslash \; \backslash mathrm\{N\}$.

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See also

• Body force
• Contact force

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