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lec07-203-08impulse-mom

lec07-203-08impulse-mom - 7-1momentum conservation7-2P vm...

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Unformatted text preview: 7-1momentum conservation7-2P conservedaallalljjjjjjinitfinalm vm v=∑∑ahPΔ=ca( )( )allalljxjjxjjjinitfinalm vm v=∑∑allalljjjjjjinitfinalm vm v=∑∑initfinalPP=()()allalljyjjyjjjinitfinalm vm v=∑∑()()x initxfinalPP=()()y inityfinalPP=2-D or 2 bodiesgeneralexternalF=caIsolated system1-D⇒momentum conservationinitfinalPP=caca7-2aSimple P conservation examplesm1v’m2m1+m2vifpi= pfm1v + 0 = (m1+m2) v’]211m[mvmv'+=7-3Simple P conservation examplesm1v2’m2ifpi= pf0 = m1v1 ’ + m2v’7-4v1’m2m1- m1v1 ’ = + m2v’If you can reverse the objects v’s7-5CO2gasM=113 Kgm=1.5 KgNewton’s force reaction force (3nd) Law & momentum conservation in rocket demoABFA(B) = - FB(A) FA(B)FB(A)force on Bforce on Adue to Bdue to ANewton’s 3rdLaw(simple but powerful !!)Fma=orpFtΔ=ΔNewton’s 2rdLawpmv=A+B system: no external forcesFtot= FA+ F...
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lec07-203-08impulse-mom - 7-1momentum conservation7-2P vm...

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