Why do springs deform permanently after a prolonged use?

Springs deform permanently because of elastic fatigueness. The elasticity of the material of spring is lost and it deforms permanently. 

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Why do we use long wires to measure the Young's modulus of wires?


Long wires are used to measure Young's modulus. Extensions in long wires may be large and so young's modulus can be measured accurately. 
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What type of material is preferred for the manufacture of springs?

Material of high value of modulus of elasticity is used to manufacture springs.
Young's modulus is large for metals, which requires a larger force to produce a small change in length. 
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Do we work in stretching a wire?

Yes. Work is done in stretching a wire. A force is applied to stretch a wire and thus, work is done. 
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Why do we prefer steel than copper in manufacturing springs?

Steel is preferred for manufacturing springs. Steel is more elastic than copper because steel has greater value of Young's modulus than copper. 
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