( ( ( ( Newton 's ) ( Second Law ) ) ( of Motion ) ) ( ( states ( that ( ( ( the ( ( force or ) action ) ) ( of ( a ( rocket engine ) ) ) ) ( is ( directly ( proportional ( to ( ( the mass ) ( expelled ( times ( its acceleration ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (NNP Newton) (POS 's)) (NNP Second) (NNP Law)) (PP (IN of) (NP (NNP Motion)))) (VP (VBZ states) (SBAR (IN that) (S (NP (NP (DT the) (NN force) (CC or) (NN action)) (PP (IN of) (NP (DT a) (NN rocket) (NN engine)))) (VP (VBZ is) (ADJP (RB directly) (JJ proportional) (PP (TO to) (NP (NP (DT the) (NN mass)) (VP (VBN expelled) (PP (CC times) (NP (PRP$ its) (NN acceleration))))))))))) (. .)))
Newton's Second Law of Motion states that the force or action of a rocket engine is directly proportional to the mass expelled times its acceleration.
(ROOT (S (S (NP (NP (NP (NNP Newton) (POS 's)) (JJ second) (NN law)) (PP (IN of) (NP (NN motion)))) (VP (VBZ is) (NP (QP (JJR more) (IN than) (DT a)) (NN definition)))) (: ;) (S (NP (PRP it)) (VP (VBZ is) (NP (NP (DT a) (NN relationship)) (PP (IN among) (NP (NP (NN acceleration)) (, ,) (NP (NN force)) (, ,) (CC and) (NP (NN mass))))))) (. .)))
Newton’s second law of motion is more than a definition; it is a relationship among acceleration, force, and mass.