( ( ( ( ( ( The ( quantity Ft ) ) ( is ( called ( the impulse ) ) ) ) , ) and ) ( it ( equals ( ( ( the change ) ( in ( momentum ( of ( the object ) ) ) ) ) struck ) ) ) ) . )
(ROOT (S (S (NP (DT The) (NN quantity) (NN Ft)) (VP (VBZ is) (VP (VBN called) (NP (DT the) (NN impulse))))) (, ,) (CC and) (S (NP (PRP it)) (VP (VBZ equals) (SBAR (S (NP (NP (DT the) (NN change)) (PP (IN in) (NP (NP (NN momentum)) (PP (IN of) (NP (DT the) (NN object)))))) (VP (VBD struck)))))) (. .)))
The quantity Ft is called the impulse , and it equals the change in momentum of the object struck.
(ROOT (S (NP (NNP Impulse)) (VP (VBZ is) (NP (NP (DT the) (NN quantity)) (PP (IN of) (NP (NP (NN force)) (VP (VBN multiplied) (PP (IN by) (NP (NP (DT the) (NN time)) (SBAR (S (NP (PRP it)) (VP (VBZ is) (VP (VBN applied)))))))))))) (. .)))