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Hooke's Law. When an elastic object - such as a spring - is stretched, the increased length is called its extension. The extension of an elastic object is directly proportional to the force applied to it: F = k Ã e. F is the force in newtons, N. k is the 'spring constant' in newtons per metre, N/m. e is the extension in metres, m.
Slide 4 of 14. Notes: Generally speaking, Hookes Law is an approximation to the way all elastic forces behave when strains are very small. This slide talks about elastic limit for tensile strains in a wire, but the same principle works for any kind of stress. A paper clip, for example, springs back into its original shape unless it is bent beyond an elastic limit where the stain becomes permanent.