( ( define ( centripetal ( acceleration ( and ( centripetal ( force I4 ) ) ) ) ) ) . )
(ROOT (S (VP (VB define) (NP (JJ centripetal) (NN acceleration) (CC and) (JJ centripetal) (NN force) (NNS I4))) (. .)))
define centripetal acceleration and centripetal force I4.
(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))))))) (. .)))