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When a copper sheet is rolled into cylinder, it tends to unroll itself. Is there any name for this?

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  • $\begingroup$ It's called backlash. If the stuff jumps off the spool and escapes, it's usually called a bird's nest. $\endgroup$ – Phil Sweet Feb 12 at 11:49
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Spiral torsion springs and constant-force springs behave in the same manner, although that's by design. A material's stiffness is what makes it want to resume its least stressed state. See Hooke's law.

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