A common technique used to measure the force constant of a spring is demonstrated by the setup as shown. The spring is hung vertically (7.12a), and an object of mass m is attached to its lower end. Under the action of the "load" mg, the spring stretches a distance d from its equilibrium position (7.12b). (A) If a spring is stretched 2.0 cm by a suspended object having a mass of 0.55 kg, what is the force constant of the spring? (B) How much work is done by the spring on the object as it stretches through this distance? F, The elongation dis caused by the weight mg the attached object. mg Figure 7.12 (Example 7.5) Determining the force constant k of a spring.

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