Difference between revisions of "Coulomb Friction Law"
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<math>S_{slide} = \mu_d N \quad{\rm if}\quad S_{stick} | <math>S_{slide} = \mu_d N \quad{\rm if}\quad S_{stick}> \mu_s N</math> | ||
and µ<sub>d</sub> and µ<sub>s</sub> are the dynamic and static coefficients of friction. If the friction coefficient is entered as a negative number, then surfaces stick whenever they are in contact but are allowed to move freely when separated. If the static coefficient of friction is less than the dynamic coefficient of friction, it is ignored. | and µ<sub>d</sub> and µ<sub>s</sub> are the dynamic and static coefficients of friction. If the friction coefficient is entered as a negative number, then surfaces stick whenever they are in contact but are allowed to move freely when separated. If the static coefficient of friction is less than the dynamic coefficient of friction, it is ignored. | ||
Revision as of 11:33, 19 January 2016
Description
This frictional contact law implements simple Coulomb friction law where
[math]\displaystyle{ S_{slide} = \mu_d N \quad{\rm if}\quad S_{stick}\gt \mu_s N }[/math]
and µd and µs are the dynamic and static coefficients of friction. If the friction coefficient is entered as a negative number, then surfaces stick whenever they are in contact but are allowed to move freely when separated. If the static coefficient of friction is less than the dynamic coefficient of friction, it is ignored.
Properties
The properties for this law are:
coeff for the dynamic coefficient of friction (default is 0). coeffStatic for the static coefficient of friction (default is -1). If the optional static coefficient of friction is changed to a positive number, it must be greater than the dynamic coefficient. The sliding will begin when it overcomes the static frictional force, but thereafter will slide with the dynamic coefficient of friction.