( ( ( Elastic ( potential energy ) ) 2 ) . )
(ROOT (NP (NP (JJ Elastic) (JJ potential) (NN energy)) (NP (CD 2)) (. .)))
Elastic potential energy 2.
(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)))))))))) (. .)))