rubber stretches more easily than copper , why?
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"Following the wisdom of George Dickson, the elastic modulus of copper is greater than that of rubber. ... That means for a big change in stress for a given change in strain, we have a relatively big elastic modulus, meaning the material is stiff."
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Elasticity is measured as ratio of stress to strain. For a given stress (stretching force per unit area) strain is much smaller in steel than in rubber and hence the answer.
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