( ( In ( accordance ( with ( ( this law ) ( of motion ) ) ) ) ) ( , ( ( no ( matter ( ( how ( ( big or ) small ) ) ( ( the cars ) are ) ) ) ) ( , ( they ( ( ( ( ( will always ) ( exert equal ) ) but ) ( oppositely ( ( directed forces ) ( on ( one another ) ) ) ) ) . ) ) ) ) ) )
(ROOT (S (PP (IN In) (NP (NP (NN accordance)) (PP (IN with) (NP (NP (DT this) (NN law)) (PP (IN of) (NP (NN motion))))))) (, ,) (ADVP (DT no) (NN matter) (SBAR (WHADVP (WRB how) (ADJP (JJ big) (CC or) (JJ small))) (S (NP (DT the) (NNS cars)) (VP (VBP are))))) (, ,) (NP (PRP they)) (VP (VP (MD will) (ADVP (RB always)) (VP (VB exert) (ADJP (JJ equal)))) (CC but) (VP (ADVP (RB oppositely)) (VBD directed) (NP (NNS forces)) (PP (IN on) (NP (CD one) (DT another))))) (. .)))
In accordance with this law of motion, no matter how big or small the cars are, they will always exert equal but oppositely directed forces on one another.
(ROOT (S (NP (NNP Work)) (VP (VBZ is) (VP (VBN done) (SBAR (RB only) (IN if) (S (NP (DT a) (NN force)) (VP (VBZ is) (VP (VBN exerted) (PP (IN in) (NP (NP (DT the) (NN direction)) (PP (IN of) (NP (NN motion))))))))))) (. .)))