Hooke's law: F = kx

Change the spring constant and the extension to see the force, the force–extension graph and the energy stored.

Works in metric or imperial units.

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Questions students ask

What is the limit of proportionality?

The point beyond which extension is no longer proportional to force: the graph stops being a straight line and the spring may not return to its length.

What formula does it use?

F = kx; elastic potential energy = ½kx².

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