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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.
, Hooke's law states that the spring will exert a restoring force on the mass. . The - sign indicates that the direction of the spring force is in the direction opposite to the. direction of the displacement.