# Elasticity

Written by Jerry Ratzlaff on . Posted in Classical Mechanics

Elasticity measures the stiffness of an elastic material.  Elasticity can deformed body and return to its original shape when the forces exerted are removed.

• Abbreviated as E or ELAS

## formula

$$E = \frac { {v_l}^2 \rho \left( 1 \;+\; Po \right) \left( 1 \;-\; 2Po \right) } { 1 \;-\; Po }$$

Where:

$$E$$ = elasticity

$$v_l$$ = longitudinal velocity

$$\rho$$ = density

$$Po$$ = Polsson's ratio