lecture chapter 9 all

# lecture chapter 9 all - Chapter 9 Linear Momentum...

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1 Chapter 9: Linear Momentum & Collisions

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4 Be careful when you add momentums, they are vectors. Direction matters. Unlike Energy and Work. Direction of mass B’s velocity: rightward Notice that my hand was hard to guarantee F external = 0 Not a very good show. See the next show:
5 Why? Because Force A acts on B and B acts on A are within the system. They are “ Internal forces!” Total External force on A and B = 0 Total work done on A > 0 Total work done on B >0 Total K of A and B >0

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6 Center of Mass
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9 Complete inelastic collisions ( stick together) Decreased total KE!

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10 Inelastic collision, Kinetic energy changed! Decreased Part of KE was lost into inelastic deformation. (cushion) later dissipated as heat, wave, sound…
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12 In elastic collisions:
13 Comparison of 3 kinds of collisions : Σ Pi = Σ Pf Always! In any collisions! Total P of the SYSTEM do not change!!! Complete inelastic Σ P i = Σ P f Σ K f < Σ K i V 1 f = V 2 f Stick together A lot of KE lost to deformation, some lost

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## This note was uploaded on 08/25/2010 for the course PHYS 111 taught by Professor Jamesm.lockhart during the Spring '09 term at S.F. State.

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lecture chapter 9 all - Chapter 9 Linear Momentum...

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