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