( Impulse ( ( is ( change ( in ( momentum ( due ( to collision ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Impulse)) (VP (VBZ is) (NP (NP (NN change)) (PP (IN in) (NP (NP (NN momentum)) (ADJP (JJ due) (PP (TO to) (NP (NN collision)))))))) (. .)))
Impulse is change in momentum due to collision.
(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))))) (. .)))