( ( Potential energy ) ( ( is ( ( the ( stored ( or ( pent-up energy ) ) ) ) ( of ( an object ) ) ) ) . ) )
(ROOT (S (NP (JJ Potential) (NN energy)) (VP (VBZ is) (NP (NP (DT the) (JJ stored) (CC or) (JJ pent-up) (NN energy)) (PP (IN of) (NP (DT an) (NN object))))) (. .)))
Potential energy is the stored or pent-up energy of an object.
(ROOT (S (NP (NP (NNP Energy)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (VP (VBN stored) (PP (IN in) (NP (DT a) (NN person) (CC or) (NN object)))))))) (VP (VBZ is) (VP (VBN called) (NP (JJ potential) (NN energy)))) (. .)))