- Most springs obey Hooke’s Law, which states that the force exerted by the spring is proportional to the extension or compression of the spring from its equilibrium length. Hooke’s Law states that to extend a spring by an amount Δx from its previous position, one needs a force F which is determined by F = k Δx. Here k is the spring constant which is a quality particular to each spring.

- If a mass M is attached to the spring and the spring extended a further distance, the spring on being released executes vertical oscillations. The motion is thus simple harmonic and could be described by the following equation.
T = 2π √ (M+m)n/g

- If a graph of T 2 against M is drawn, a straight line is obtained from which g and m can be found

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