What does the magnitude of static friction depend on?

[AFG34]

I'm curious as to what does the limit of the magnitude of static friction depends on between any two objects.

 

[russ_watters]

Normal force and friction coefficient.

 

[AFG34]

what does the coefficient of friction depend on?
-how smooth or rough the surface of the objects are?

 

[AFG34]

also, why is the coefficient of static friction larger than kinetic? Can someone explain this to me with reference to a block on an inclined plane. Thnx

 

[stewartcs]

what does the coefficient of friction depend on?

The two material's properties.

-how smooth or rough the surface of the objects are?

No.

Caveat: Cold welds.

 

[stewartcs]

also, why is the coefficient of static friction larger than kinetic? Can someone explain this to me with reference to a block on an inclined plane. Thnx

http://en.wikipedia.org/wiki/Coefficient_of_friction

 

[AFG34]

thnx :D