( Gravity ( ( provides ( ( the ( restoring force ) ) ( -LRB- ( ( ( a component ) ( of ( ( the weight ) ( of ( the pendulum ) ) ) ) ) -RRB- ) ) ) ) . ) )
(ROOT (S (NP (NNP Gravity)) (VP (VBZ provides) (NP (NP (DT the) (JJ restoring) (NN force)) (PRN (-LRB- -LRB-) (NP (NP (DT a) (NN component)) (PP (IN of) (NP (NP (DT the) (NN weight)) (PP (IN of) (NP (DT the) (NN pendulum)))))) (-RRB- -RRB-)))) (. .)))
Gravity provides the restoring force (a component of the weight of the pendulum).
(ROOT (S (NP (NNP Weight)) (VP (VBZ is) (NP (NP (DT the) (NN result)) (PP (IN of) (NP (NP (DT the) (NN force)) (PP (IN of) (NP (NP (NN gravity)) (VP (VBG being) (VP (VBN opposed) (PP (IN by) (NP (DT the) (JJ normal) (NN force))))))))))) (. .)))