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nuclear energy energy that can be liberated by changes in the nucleus of an atom (as by fission of a heavy nucleus or fusion of light nuclei into heavier ones with accompanying loss of mass). potential energy energy at rest or not manifested in actual work.
F in the definition of potential energy is the force exerted by the force field, e.g., gravity, spring force, etc. The potential energy U is equal to the work you must do against that force to move an object from the U=0 reference point to the position r.