# Stress

Written by Jerry Ratzlaff on . Posted in Classical Mechanics

Stress, abbreviated as $$\sigma$$ (Greek symbol sigma), is the force per unit area of cross-section.  The maximum stress of a material before it breaks is called breaking stress or ultimate tensial stress.

### Stress formula

$$\large{ \sigma = \frac{F}{A} }$$

Where:

$$\large{ \sigma }$$  (Greek symbol sigma) = stress

$$\large{ A }$$ = cross-section area

$$\large{ F }$$ = force

Solve for:

$$\large{ A = \frac{F}{\sigma} }$$

$$\large{ F = \sigma \; A }$$