y = distance stretched vertically(adsbygoogle = window.adsbygoogle || []).push({});

k = spring constant

M = mass of weight on spring

My Physics book says the work to stretch a spring is .5ky^{2}. If I set that equal to the work done by gravity on the weight (9.8xM) and solve for the constant I get k = (9.8M)/(.5y)

My Physics book also says that the force from a spring is ky. If I set that equal to the force of gravity on the weight (9.8M) and solve for the constant I get k = (9.8M)/(y)

Why do I get a different constant??

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# Homework Help: Spring constant discrepency (force vs work)

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