# Friction

Written by Jerry Ratzlaff. Posted in Fluid Mechanics

Friction is the mechanical resistance to the relative movement of two surfaces. There are two main types of friction; static friction and dynamic friction. Typically static friction is greater than dynamic friction.

• Abbreviated as FRICT

## formula

$$f =\mu F_n \;$$

Where:

$$f$$ = friction

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

$$F_n$$ = normal force