Question

Why are the springs made of steel and not of copper?

Answer 1

steel has a higher value of youngs modulus... so the breaking stress is more in steel than in copper

Answer 2

$\underline{\underline{\Huge\mathfrak{Answer-: }}}$

◆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.