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

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