Question

why springs made of steel and not of copper?

Answer 1

Elasticity of steel is good. Whereas in copper it does not rebound back to its original shape whereas steel come back to its original shape.

Answer 2

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◆A spring will be better one, if a large restoring force is set up in it on being deformed, which in turn depends upon the elasticity of the material of the spring. Since the Young's modulus of elasticity of steel is more than that of copper, hence steel is preferred in making the springs.