Surface force
![](../I/m/Free_body_diagram2.svg.png)
Block on a ramp and corresponding free body diagram of the block showing the surface force from the ramp onto the bottom of the block and separated into two components, a normal force N and a frictional shear force f, along with the body force of gravity mg acting at the center of mass.
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 into two perpendicular components: normal forces and shear forces. A normal force acts normally over an area and a shear force acts tangentially over an area.
Equations for surface force
Surface force due to pressure
- , where f = force, p = pressure, and A = area on which a uniform pressure acts
Examples
Pressure related surface force
Since pressure is , and area is a ,
- a pressure of over an area of will produce a surface force of .
See also
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