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<p>Potential energy is the energy by virtue of an object's position relative to other objects. Potential energy is often associated with restoring <a href="page.php?w=force">force</a>s such as a <a href="page.php?w=spring_%28device%29">spring</a> or the force of <a href="page.php?w=gravity">gravity</a>. The action of stretching a spring or lifting a mass is performed by an external force that works against the force field of the potential.  This work is stored in the force field, which is said to be stored as potential energy.  If the external</p><p>
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