Modulus of Elasticity tells us how materials change shape when
we apply forces to them:
For stretching wire Young’s Modulus Y:
F
∆L
=Y
A
L
This is like our work with SRINGS:
F = −k∆x
F
Except by using the force divided by the area of the wire A
∆L
And the stretch divided by the length of the wire
L
The proportionality constant Y only depends on the material, not
its size.
So the equation applies to any length L or radius ( A
wire.
= πr 2 ) of