( ( ( ( ( ( an object ) ( at rest ) ) ( will ( stay ( at rest ) ) ) ) and ) ( ( ( an object ) ( in motion ) ) ( will ( ( stay ( in ( motion ( with ( the ( same velocity ) ) ) ) ) ) ( unless ( ( acted on ) ( by ( an ( unbalanced force ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NP (DT an) (NN object)) (PP (IN at) (NP (NN rest)))) (VP (MD will) (VP (VB stay) (PP (IN at) (NP (NN rest)))))) (CC and) (S (NP (NP (DT an) (NN object)) (PP (IN in) (NP (NN motion)))) (VP (MD will) (VP (VB stay) (PP (IN in) (NP (NP (NN motion)) (PP (IN with) (NP (DT the) (JJ same) (NN velocity))))) (SBAR (IN unless) (S (VP (VBD acted) (PRT (RP on)) (PP (IN by) (NP (DT an) (JJ unbalanced) (NN force))))))))) (. .)))
an object at rest will stay at rest and an object in motion will stay in motion with the same velocity unless acted on by an unbalanced 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))))) (. .)))