Hooke's Law
The red line in this graph illustrates how force, F, varies with position according to Hooke's law. The slope of this line corresponds to the spring constant k. The dotted line shows what the actual (experimental) plot of force might look like. The pictures of spring states at the bottom of the graph correspond to some points of the plot; the middle one is in the relaxed state (no force applied).
Source
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"HookesLawForSpring-English.png."
https://upload.wikimedia.org/wikipedia/commons/f/f0/HookesLawForSpring-English.png
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