( CENTRIPETAL ( ( FORCE ( ( The force ) ( required ( to ( keep ( ( an object ) ( moving ( in ( a ( curved ( or ( circular path ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP CENTRIPETAL)) (VP (VBP FORCE) (NP (NP (DT The) (NN force)) (VP (VBN required) (S (VP (TO to) (VP (VB keep) (NP (NP (DT an) (NN object)) (VP (VBG moving) (PP (IN in) (NP (DT a) (JJ curved) (CC or) (JJ circular) (NN path))))))))))) (. .)))
CENTRIPETAL FORCE The force required to keep an object moving in a curved or circular path.
(ROOT (S (NP (JJ Centripetal) (NNS forces)) (VP (VBP cause) (S (NP (NNS objects)) (VP (TO to) (VP (VB turn) (PRT (RP around)) (ADVP (RB continuously)) (PP (IN in) (NP (DT a) (NN circle))))))) (. .)))