( weight ( ( is ( ( a force ) ( ( applied ( by gravity ) ) ( to matter ) ) ) ) . ) )
(ROOT (S (NP (NN weight)) (VP (VBZ is) (NP (NP (DT a) (NN force)) (VP (VBN applied) (PP (IN by) (NP (NN gravity))) (PP (TO to) (NP (NN matter)))))) (. .)))
weight is a force applied by gravity to matter.
(ROOT (S (NP (NNP Weight)) (VP (VBZ is) (NP (NP (DT the) (NN force)) (PP (IN of) (NP (NN gravity))))) (. .)))