( ( Hint ( An impulse ) ) ( ( is ( ( a force ) ( applied ( for ( a ( time interval ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Hint) (DT An) (NN impulse)) (VP (VBZ is) (NP (NP (DT a) (NN force)) (VP (VBN applied) (PP (IN for) (NP (DT a) (NN time) (NN interval)))))) (. .)))
Hint An impulse is a force applied for a time interval.
(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)))))))))))) (. .)))