( ( The ( elastic ( potential ( energy equation ) ) ) ) ( ( is ( used ( in ( calculations ( of ( positions ( of ( mechanical equilibrium ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ elastic) (JJ potential) (NN energy) (NN equation)) (VP (VBZ is) (VP (VBN used) (PP (IN in) (NP (NP (NNS calculations)) (PP (IN of) (NP (NP (NNS positions)) (PP (IN of) (NP (JJ mechanical) (NN equilibrium))))))))) (. .)))
The elastic potential energy equation is used in calculations of positions of mechanical equilibrium.
(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)))))))))) (. .)))