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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.
Since the mass of the spring was 7.0 gm the value of m used to determine k N mTmk 217.7 1.0 /4 22 = = Â±Ï These two values of k show agreement within the limits of accuracy of the experiment and as such are evidence that the spring used, at least over a range of loads from 2 to 9 kg, obeys Hooke's Law.