( ( 2.2 ( An object ) ) ( ( ( ( ( remains ( at rest ) ) or ) ( maintains ( ( a ( constant ( ( speed and ) direction ) ) ) ( of motion ) ) ) ) ( unless ( ( an ( unbalanced force ) ) ( acts ( on it ) ) ) ) ) . ) )
(ROOT (S (NP (NP (CD 2.2)) (NP (DT An) (NN object))) (VP (VP (VBZ remains) (PP (IN at) (NP (NN rest)))) (CC or) (VP (VBZ maintains) (NP (NP (DT a) (JJ constant) (NN speed) (CC and) (NN direction)) (PP (IN of) (NP (NN motion))))) (SBAR (IN unless) (S (NP (DT an) (JJ unbalanced) (NN force)) (VP (VBZ acts) (PP (IN on) (NP (PRP it))))))) (. .)))
2.2 An object remains at rest or maintains a constant speed and direction of motion unless an unbalanced force acts 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))))) (. .)))