Hooke's Law
Plot of applied force F vs. elongation X for a helical spring according to Hooke's law (solid line) and what the actual plot might look like (dashed line). Red is used extension, blue for compression. At bottom, schematic pictures of spring states corresponding to some points of the plot; the middle one is in the relaxed state (no force applied).
Source
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"HookesLawForSpring-English."
http://en.wikipedia.org/wiki/File:HookesLawForSpring-English.png
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