( ( An object ) ( ( ( ( remains ( at rest ) ) or ) ( continues ( to ( ( move ( in ( ( a ( straight line ) ) ( with ( a ( constant velocity ) ) ) ) ) ) ( if ( there ( is ( ( no ( unbalanced force ) ) ( acting ( on it ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT An) (NN object)) (VP (VP (VBZ remains) (PP (IN at) (NP (NN rest)))) (CC or) (VP (VBZ continues) (S (VP (TO to) (VP (VB move) (PP (IN in) (NP (NP (DT a) (JJ straight) (NN line)) (PP (IN with) (NP (DT a) (JJ constant) (NN velocity))))) (SBAR (IN if) (S (NP (EX there)) (VP (VBZ is) (NP (NP (DT no) (JJ unbalanced) (NN force)) (VP (VBG acting) (PP (IN on) (NP (PRP it))))))))))))) (. .)))
An object remains at rest or continues to move in a straight line with a constant velocity if there is no unbalanced force acting on it.
(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))))) (. .)))