( ( ( ( ( ( ( Centrifugal force ) ( is tangential ) ) but ) ( ( centrifugal acceleration ) ( is ( outward ( positive ( second curvature ) ) ) ) ) ) and ) ( ( ( the ( equal ( and ( opposite reaction ) ) ) ) ( of this ) ) ( is ( ( the ( fifth force ) ) ( which ( is ( cause ( by ( ( ( centripetal acceleration ) and ) ( not ( the ( scalar ( centripetal force ) ) ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (JJ Centrifugal) (NN force)) (VP (VBZ is) (ADJP (JJ tangential)))) (CC but) (S (NP (JJ centrifugal) (NN acceleration)) (VP (VBZ is) (VP (VBN outward) (NP (JJ positive) (JJ second) (NN curvature))))) (CC and) (S (NP (NP (DT the) (JJ equal) (CC and) (JJ opposite) (NN reaction)) (PP (IN of) (NP (DT this)))) (VP (VBZ is) (NP (NP (DT the) (JJ fifth) (NN force)) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (VP (VB cause) (PP (IN by) (NP (NP (JJ centripetal) (NN acceleration)) (CC and) (NP (RB not) (DT the) (JJ scalar) (JJ centripetal) (NN force))))))))))) (. .)))
Centrifugal force is tangential but centrifugal acceleration is outward positive second curvature and the equal and opposite reaction of this is the fifth force which is cause by centripetal acceleration and not the scalar centripetal force.
(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))))))) (. .)))