Free body diagram N F F. N F. Figure 5.15 (a) What is the mechanical advantage of a nail puller--similar to the one shown in Figure 5.15--where you exert a force 45.0 cm from the pivot and the nail is 1.85 cm on the other side? (b) What minimum force must you exert to apply a force of 1250 N to the nail?

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Strain energy

The term strain indicates the variation in an object's length, area, and volume when the object is subjected to an external force. The external force may be of normal, shear, moment, torque, etc. The strain in an object depends on the types of external force and cross-section of the object. Mathematically, the evaluation of strain can be obtained with the help of elastic constants.