( ( ( Weight ( -LRB- ( mass -RRB- ) ) ) ( of ( an object ) ) ) ( ( measures ( ( the force ) ( of ( ( ( the ( Earth 's ) ) gravity ) ( on ( that object ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Weight) (-LRB- -LRB-) (NN mass) (-RRB- -RRB-)) (PP (IN of) (NP (DT an) (NN object)))) (VP (VBZ measures) (NP (NP (DT the) (NN force)) (PP (IN of) (NP (NP (NP (DT the) (NN Earth) (POS 's)) (NN gravity)) (PP (IN on) (NP (DT that) (NN object))))))) (. .)))
Weight (mass) of an object measures the force of the Earth's gravity on that object.
(ROOT (S (NP (NNP Weight)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (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)))))))))))) (. .)))