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Lecture-12 - Impulse ImpulseandMomentum Lecture#12 Ch.7.1...

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pulse and Momentum Impulse and Momentum Lecture #12 – Ch. 7.1 – 7.3 Physics 125–Fall 2010 Dr. Mike Melnichuk [email protected] Office: 2409 Randall Lab [email protected] ffice Hours: 2:00 :00 / Mon & Tue Rm 1416 Randall Lab Office Hours: 2:00 – 4:00 / Mon. & Tue. in Rm. 1416 Randall Lab.

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Impulse and Momentum We start with Newton's Second Law: 00 0 . ff f net v v mv mv p p J Fm a m t t t −− == = = = Δ Δ Δ G G GG G G G G G where: tt ΔΔ 0 is the INITIAL (vector) MOMEN p mv = TUM, is the FINAL (vector) MOMENTUM and pm v = t is the IMPULSE. n e t Jp p m v m v F =− = G G
Conservation of Momentum From the previous slide: p p m v m v Ft = = Δ GG G G 00 , we have: ff n e t Jp = G G 0 . If it so happens that 0 N, the fn e t net p p F t F = Δ = G n: 0 . pp p p −= = G G the total (vector) momentum is CONSERVED. it so happens that the net (external) orce on a system G If it so happens that the net (external) force on a system is null, the total (vector) momentum is conserved (in time).

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Lecture-12 - Impulse ImpulseandMomentum Lecture#12 Ch.7.1...

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