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many laws are approximations : Hooke's law, "ut tenso sic vis" (as the length, so the force) talks about deformation of a beam or the extension of a coil spring caused by a force.
Hooke developed it on a coil spring, but it appleis to almost any elastic change caused by an appliction of force - except for coil springs, deformation of which involves a combination torsion, bending, and witchcraft. :-)
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