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Unread 02-11-2007, 20:13
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Re: Contact Area and its Relation to Friction?

Quote:
Originally Posted by Paul Copioli View Post
Static friction force does not depend upon surface area. Static friction force does not depend upon surface area. Static friction force does not depend upon surface area.
You can change this slightly and avoid certain potential counterarguments:

Static friction force depends only on the coefficient of friction and the "normal force" (weight, for horizontal surfaces).



There are boundary conditions for some combinations of materials where the coefficient of friction can change based on pressure, and since pressure depends on area and force, changing the area can affect the friction force, but the static friction force still depends only on the coefficient of friction and the normal force.