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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.
Yes, except for that minus sign. Just give the magnitude of the force. (The meaning of the minus sign in Hooke's law is just that the force exerted by the spring is opposite to the displacement from equilibrium. If you pull the spring to the right, the spring force pulls back to the left.