▁and ▁is ▁considered ▁syn onymous ▁with ▁the ▁term ▁" imp ulse ". ▁ ▁Variable ▁mass ▁ ▁The ▁application ▁of ▁Newton ' s ▁second ▁law ▁for ▁variable ▁mass ▁allows ▁imp ulse ▁and ▁momentum ▁to ▁be ▁used ▁as ▁analysis ▁tools ▁for ▁jet - ▁or ▁ro cket - prop elled ▁vehicles . ▁In ▁the ▁case ▁of ▁rock ets , ▁the ▁imp ulse ▁im part ed ▁can ▁be ▁normal ized ▁by ▁unit ▁of ▁prop ell ant ▁exp ended , ▁to ▁create ▁a ▁performance ▁parameter , ▁specific ▁imp ulse . ▁This ▁fact ▁can ▁be ▁used ▁to ▁derive ▁the ▁T si ol kov sky ▁ro cket ▁equation , ▁which ▁rel ates ▁the ▁vehicle ' s ▁prop uls ive ▁change ▁in ▁velocity ▁to ▁the ▁engine ' s ▁specific ▁imp ulse ▁( or ▁no zz le ▁exhaust ▁velocity ) ▁and ▁the ▁vehicle ' s ▁prop ell ant - mass ▁ratio . ▁ ▁See ▁also ▁W ave – part icle ▁du ality ▁defines ▁the ▁imp ulse ▁of ▁a ▁wave ▁collision . ▁The ▁pres ervation ▁of ▁momentum ▁in ▁the ▁collision ▁is ▁then ▁called ▁phase ▁matching . ▁App lications ▁include : ▁Com pton ▁effect ▁Non linear ▁opt ics ▁Ac ou sto - opt ic ▁mod ulator ▁Electron ▁ph on on ▁scatter ing ▁▁ ▁Di rac ▁delta ▁function , ▁mathematical ▁abstra ction ▁of ▁a ▁pure ▁imp ulse ▁ ▁Notes ▁ ▁Bibli ography ▁ ▁External ▁links ▁ ▁Dynam ics ▁ ▁Category : Art icles ▁containing ▁video ▁cli ps ▁Category : Class ical ▁mechan ics ▁Category : Con cept s ▁in ▁physics ▁Category : Phys ical ▁quantities