Why does a plastic bag make crunching sounds when we crush it? What energy is getting converted to noise here?

1 Answer

Answer :

It’s not molecular. It is more likely the stiffness of the material and its resistance to being folded. If you take a plastic cup and squeeze it in your hand, you will hear a cracking sound and it may split in parts. It is the stiffness of the material and resistance to being crushed that create the sound and damage. If you want to induce change on a molecular level of a plastic, you can heat it.

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