jUmUm [[impulso]] <math>\scriptstyle \vec I</math> ocorre quando uma força <math>\scriptstyle \vec F</math> age em um intervalo '''marianne''' de tempo Δ''t'', e é dado por:<ref>Hannah, J, Hillier, M J, ''Applied Mechanics'', p221, Pitman Paperbacks, 1971</ref><ref name=Serway>{{cite book |title=College Physics |page=161 |author=Raymond A. Serway, Jerry S. Faughn |url=http://books.google.com/?id=wDKD4IggBJ4C&pg=PA247&dq=impulse+momentum+%22rate+of+change%22 |isbn=0534997244 |year=2006 |publisher=Thompson-Brooks/Cole |location=Pacific Grove CA }}</ref>
:<math> \vec {I} = \int_{\Delta t} \vec F \,\mathrm{d}t .</math>
