( ( Weight Weight ) ( ( is ( ( the force ) ( of ( gravity ( acting ( on us ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Weight) (NNP Weight)) (VP (VBZ is) (NP (NP (DT the) (NN force)) (PP (IN of) (NP (NP (NN gravity)) (VP (VBG acting) (PP (IN on) (NP (PRP us)))))))) (. .)))
Weight Weight is the force of gravity acting on us.
(ROOT (S (NP (NNP Weight)) (VP (VBZ is) (NP (NP (DT the) (NN force)) (PP (IN of) (NP (NN gravity))))) (. .)))