( Impulse ( ( is ( equal ( to ( momentum change ) ) ) ) . ) )
(ROOT (S (NP (NNP Impulse)) (VP (VBZ is) (ADJP (JJ equal) (PP (TO to) (NP (NN momentum) (NN change))))) (. .)))
Impulse is equal to momentum change.
(ROOT (S (NP (NP (NNP Change)) (PP (IN in) (NP (NP (NN momentum)) (PP (IN in) (NP (DT an) (NN object)))))) (VP (VBZ is) (ADJP (JJ equivalent) (PP (TO to) (NP (NN impulse))))) (. .)))