Nylon stretches much more than steel because it has a much lower elastic modulus. In the process of stretching to close to its maximum (ultimate) strength, Nylon will exceed its yield strength, and acquire a permanent deformation. After repeated use at close to the ultimate strength, it will break.
Lifting material with a cable that stretches a lot will make it diffcult to handle the lifted material, because it will vibrate up and down, possibly leading to damage.
Nylon and Steel have exactly the same resistance to breaking under tension. Explain then why someone would use a steel cable instead of a nylon cable for lifting a heavy load.
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