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Lecture 21

# Lecture 21 - Last time Physics 231 General University...

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1 Physics 231 General University Physics Spring 2007 Lecture 21 Last time ± Conservation of Momentum ± Impulse and Momentum Today ± Impulse and Momentum ± Collision Collisions ± Force as a function of time is very complicated (and probably unknown!) Collisions (cont.) ± But Newton’s III law guarantees that the forces of interaction are equal and opposite (at each instant of time), and thus so too are their integrals ± That is, the impulse are equal and opposite dt F I G G 1 2 2 1 on on I I G G = Collisions (cont.) ± But from Impulse- Momentum (Newton’s II) ± Thus the changes in momentum are equal and opposite net I p Δ = G G 12 pp Δ Δ = − G G

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2 Conservation of Momentum, Archer Example ± The archer is standing on a frictionless surface (ice) ± Approaches: ± Newton’s Second Law ? ± No, no information about F or a ± Energy approach ? ± No, no information about work or energy ± Momentum ? ± yes Archer Example (cont.) ± Let the system be the archer with bow (particle 1)
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Lecture 21 - Last time Physics 231 General University...

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