( Elastic ( ( Potential ( ( Energy and ) ( Restoring Force ) ) ) . ) )
(ROOT (S (NP (NNP Elastic)) (VP (VBZ Potential) (NP (NP (NNP Energy)) (CC and) (NP (NNP Restoring) (NNP Force)))) (. .)))
Elastic Potential Energy and Restoring Force.
(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)))))))))) (. .)))