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Beforeandafter pictorial representation
•
Define the system.
•
Use two drawings to show the system
before
and
after
the interaction.
•
List known information and identify what
you are trying to find.
collision
impulsive force
momentum,
impulse,
J
x
p
r
impulsemomentum theorem
momentum bar chart
impulse approximation
total momentum,
P
r
isolated system
law of conservation of
momentum
perfectly inelastic collision
explosion
SUMMARY
The goals of Chapter 9 have been to introduce the ideas of impulse and momentum and
to learn a new problemsolving strategy based on conservation laws.
General Principles
Law of Conservation of Momentum
The total momentum
of an isolated system is
a constant. Thus
Newton’s Second Law
In terms of momentum, Newton’s second law is
F
r
5
dp
r
dt
P
r
f
5
P
r
i
P
r
5
p
r
1
1
p
r
2
1
c
Solving Momentum Conservation Problems
MODEL
Choose an isolated system or a system that is isolated
during at least part of the problem.
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This note was uploaded on 09/26/2010 for the course PHYS 021 taught by Professor Dick during the Spring '08 term at GWU.
 Spring '08
 Dick
 Physics, Impulse And Momentum, Momentum

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