( ( A scientist ) ( ( ( defines ( your ( ` ( weight ' ) ) ) ) ( as ( ( ( a measure ) ( of ( ( the force ) ( of gravity ) ) ) ) ( ( pulling ( your body ) ) ( towards ( the planet ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN scientist)) (VP (VBZ defines) (NP (PRP$ your) (`` `) (NN weight) ('' ')) (PP (IN as) (S (NP (NP (DT a) (NN measure)) (PP (IN of) (NP (NP (DT the) (NN force)) (PP (IN of) (NP (NN gravity)))))) (VP (VBG pulling) (NP (PRP$ your) (NN body)) (PP (IN towards) (NP (DT the) (NN planet))))))) (. .)))
A scientist defines your 'weight' as a measure of the force of gravity pulling your body towards the planet.
(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)))))))))))) (. .)))