( ( ( ( Weight , ) ( on ( the ( other hand ) ) ) ) , ) ( ( measures ( ( the force ) ( of ( gravity ( ( pulling down ) ( on ( the mass ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Weight)) (, ,) (PP (IN on) (NP (DT the) (JJ other) (NN hand))) (, ,)) (VP (VBZ measures) (NP (NP (DT the) (NN force)) (PP (IN of) (NP (NP (NN gravity)) (VP (VBG pulling) (PRT (RP down)) (PP (IN on) (NP (DT the) (NN mass)))))))) (. .)))
Weight, on the other hand, measures the force of gravity pulling down on the 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)))))))))) (. .)))