( ( Kinetic energy ) ( ( is ( due ( to ( ( the ( actual movement ) ) ( of ( ( atoms or ) molecules ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Kinetic) (NN energy)) (VP (VBZ is) (ADJP (JJ due) (PP (TO to) (NP (NP (DT the) (JJ actual) (NN movement)) (PP (IN of) (NP (NNS atoms) (CC or) (NNS molecules))))))) (. .)))
Kinetic energy is due to the actual movement of atoms or molecules.
(ROOT (S (NP (NP (DT The) (NN sum)) (PP (IN of) (NP (NP (DT the) (JJ kinetic) (CC and) (JJ potential) (NNS energies)) (PP (IN of) (NP (NP (DT a) (NN system) (POS 's)) (NNS atoms) (CC and) (NNS molecules)))))) (VP (VBZ is) (VP (VBN called) (NP (JJ internal) (NN energy)))) (. .)))