( ( ( The impulse ) ( experienced ( by ( an object ) ) ) ) ( ( ( is always ) ( equal ( to ( ( the change ) ( in ( its momentum ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN impulse)) (VP (VBN experienced) (PP (IN by) (NP (DT an) (NN object))))) (VP (VBZ is) (ADVP (RB always)) (ADJP (JJ equal) (PP (TO to) (NP (NP (DT the) (NN change)) (PP (IN in) (NP (PRP$ its) (NN momentum))))))) (. .)))
The impulse experienced by an object is always equal to the change in its momentum.
(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))))) (. .)))