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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.
Robert Hooke developed the law of elasticity, known as Hooke's Law, which states that stress is directly proportional to strain. He is also the originator of the word cell in biology.