( ( Because ( ( the ball ) ( accelerates ( in ( ( the direction ) ( of ( the force ) ) ) ) ) ) ) ( , ( it ( ( accelerates centripetally ) . ) ) ) )
(ROOT (S (SBAR (IN Because) (S (NP (DT the) (NN ball)) (VP (VBZ accelerates) (PP (IN in) (NP (NP (DT the) (NN direction)) (PP (IN of) (NP (DT the) (NN force)))))))) (, ,) (NP (PRP it)) (VP (VBZ accelerates) (ADVP (RB centripetally))) (. .)))
Because the ball accelerates in the direction of the force, it accelerates centripetally.
(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))))))) (. .)))