( ( To ( account ( for ( the ( centripetal acceleration ) ) ) ) ) ( , ( ( a ( centripetal force ) ) ( ( must ( be ( acting ( on ( this object ) ) ) ) ) . ) ) ) )
(ROOT (S (S (VP (TO To) (VP (VB account) (PP (IN for) (NP (DT the) (JJ centripetal) (NN acceleration)))))) (, ,) (NP (DT a) (JJ centripetal) (NN force)) (VP (MD must) (VP (VB be) (VP (VBG acting) (PP (IN on) (NP (DT this) (NN object)))))) (. .)))
To account for the centripetal acceleration, a centripetal force must be acting on this object.
(ROOT (S (NP (JJ Centripetal) (NN force)) (VP (VBZ is) (NP (NP (DT the) (NN force)) (SBAR (WHNP (WDT that)) (S (VP (VBZ causes) (NP (JJ centripetal) (NN acceleration))))))) (. .)))