( ( Elastic ( potential energy ) ) ( ( is ( ( the energy ) ( ( stored ( in ( elastic materials ) ) ) ( as ( ( the result ) ( of ( their ( ( stretching or ) compressing ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Elastic) (JJ potential) (NN energy)) (VP (VBZ is) (NP (NP (DT the) (NN energy)) (VP (VBN stored) (PP (IN in) (NP (JJ elastic) (NNS materials))) (PP (IN as) (NP (NP (DT the) (NN result)) (PP (IN of) (NP (PRP$ their) (NN stretching) (CC or) (NN compressing)))))))) (. .)))
Elastic potential energy is the energy stored in elastic materials as the result of their stretching or compressing.
(ROOT (S (S (VP (VBG Changing) (NP (NP (DT the) (NN shape)) (PP (IN of) (NP (DT an) (JJ elastic) (NN material)))))) (VP (VBZ gives) (NP (PRP it)) (NP (JJ potential) (NN energy))) (. .)))