# Static Friction Coefficient

Written by Jerry Ratzlaff on . Posted in Dimensionless Numbers

## Static Friction Coefficient

Static friction coefficient ( $$\mu_s$$ ) (dimensionless number) (also called coefficient of static friction) is the amount of force that resists motion that is on the verge of motion.

### Static Friction Coefficient formula

$$\mu_s = \frac {f_s}{F_n}$$

Where:

$$\mu_s$$ (Greek symbol mu) = static friction coefficient

$$f_s$$ = static friction

$$F_n$$ = normal force