Surface force

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.

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}=frac{N}{m^2} Area is a (length)cdot(width) = m cdot m = m^2

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

: 5 Pa cdot 20 m^2 = 100 N

See also

*Body force


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