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 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

[edit] Equations for surface force

[edit] Surface force due to pressure

f_s=p \cdot A \

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

[edit] Examples

[edit] 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 20m2 find the surface force due to pressure.

5 Pa \cdot 20 m^2 = 100 N

[edit] See also


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