# Kinetic Friction

Kinetic friction, abbreviated as \(f_k \), also called dynamic friction or sliding friction, is the force opposing two objects rubbing together that are moving relative to each other.

### Kinetic Friction formula

\(\large{ f_k = \mu_k F_n }\)

Where:

\(\large{ f_k }\) = kinetic friction

\(\large{ \mu_k }\) (Greek symbol mu) = kinetic friction coefficient

\(\large{ F_n }\) = normal force

Solve for:

\(\large{ \mu _k = \frac {f_k}{F_n} }\)

\(\large{ F_n = \frac {f_k}{\mu_k} }\)

Tags: Equations for Friction