( ( An object ) ( ( is ( brought ( to ( rest ( by ( a ( constant force ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT An) (NN object)) (VP (VBZ is) (VP (VBN brought) (S (VP (TO to) (VP (VB rest) (PP (IN by) (NP (DT a) (JJ constant) (NN force)))))))) (. .)))
An object is brought to rest by a constant force.
(ROOT (S (SBAR (IN If) (S (NP (DT no) (JJ unbalanced) (NN force)) (VP (VBZ acts) (PP (IN on) (NP (DT an) (NN object)))))) (NP (DT the) (NN object)) (VP (VBZ remains) (PP (PP (IN at) (NP (JJ constant) (NN velocity))) (CC or) (PP (IN at) (NP (NN rest))))) (. .)))