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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.
Hookeâs law is used to calculate the force that would need to be applied on an object attached to a spring in order to get its position, after some number of iterations, to return to the point where the spring is fully compressed and unmoving at the target. The formula is simple and is as follows: