( ( This force ) ( ( is ( equal ( to ( ( the ( centripetal acceleration ) ) ( times ( ( the mass ) ( of ( the atom ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This) (NN force)) (VP (VBZ is) (ADJP (JJ equal) (PP (TO to) (NP (NP (DT the) (JJ centripetal) (NN acceleration)) (PP (CC times) (NP (NP (DT the) (NN mass)) (PP (IN of) (NP (DT the) (NN atom))))))))) (. .)))
This force is equal to the centripetal acceleration times the mass of the atom.
(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))))))) (. .)))