( Weight ( ( is ( ( a measure ) ( of ( ( the ( downward ( force ( gravity exerts ) ) ) ) ( on ( an object ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Weight)) (VP (VBZ is) (NP (NP (DT a) (NN measure)) (PP (IN of) (NP (NP (DT the) (JJ downward) (NN force) (NN gravity) (NNS exerts)) (PP (IN on) (NP (DT an) (NN object))))))) (. .)))
Weight is a measure of the downward force gravity exerts on an object.
(ROOT (S (NP (NNP Weight)) (VP (VBZ is) (NP (NP (DT the) (NN measure)) (PP (IN of) (NP (NP (DT the) (NN force)) (PP (IN of) (NP (NP (NN gravity)) (VP (VBG pulling) (PRT (RP down)) (PP (IN on) (NP (DT an) (NN object)))))))))) (. .)))