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Friction as a function of area ANSWER
Since pressure P = f/A, the area contacting the ground is inversely proportional to the pressure applied at each point of contact <edit> (f = P*A) </edit>
f in f = P * A is the normal force.
Ex:
100 oz/in^2 = P oz * 4 in^2; P = 25
100 oz/in^2 = P oz * 5 in^2; P = 20
When you increase the area, you also relieve pressure
f = uN is equivalent to f = u (P * A) because Normal Force = Pressure * Area
Last edited by Brandon Martus : 31-12-2002 at 18:09.
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