( ( Spring ( Potential Energy ) ) ( -LRB- ( ( Elastic ( Potential Energy ) ) -RRB- ) ) )
(ROOT (NP (NP (NNP Spring) (NNP Potential) (NNP Energy)) (PRN (-LRB- -LRB-) (NP (NNP Elastic) (NNP Potential) (NNP Energy)) (-RRB- -RRB-))))
Spring Potential Energy (Elastic Potential Energy)
(ROOT (S (NP (DT The) (ADJP (NN term) (JJ elastic)) (JJ potential) (NN energy)) (VP (VBZ is) (VP (VBN used) (S (VP (TO to) (VP (VB describe) (S (NP (JJ potential) (NN energy)) (ADJP (JJ due) (PP (TO to) (NP (NP (DT an) (NN object) (POS 's)) (NN shape)))))))))) (. .)))