( Weight ( ( ( is just ) ( ( a measure ) ( of ( ( the force ) ( of ( gravity ( on ( a mass ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Weight)) (VP (VBZ is) (ADVP (RB just)) (NP (NP (DT a) (NN measure)) (PP (IN of) (NP (NP (DT the) (NN force)) (PP (IN of) (NP (NP (NN gravity)) (PP (IN on) (NP (DT a) (NN mass))))))))) (. .)))
Weight is just a measure of the force of gravity on a mass.
(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)))))))))) (. .)))