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M
OMENTUM
8
Answers to MultipleChoice Problems
8.
A, D
11.
B, D
14.
A, B
Solutions to Problems
8.1. Set Up:
Use coordinates where
is to the right. In (a) – (c) denote the two objects as
A
and
B
.
In (d) call the third object
C
.
Solve: (a)
(b)
(c)
8.2. Set Up:
The signs of the velocity components indicate their directions. Call the objects
A
and
B
.
Solve: (a)
(b)
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(d)
8.8. Set Up:
Consider the system consisting of the two skaters.
Assume the heavier skater (
B
)
travels to the right and take this to be the direction.
Solve: (a)
There is no horizontal external force so
The skaters are initially at rest so
The lighter skater travels to the left at
(b)
The kinetic energy of the system was produced by the work the two skaters do on each
other.
8.13. Set Up:
Let
be to the right.
Solve: (a)
says
and
(b)
and
Reflect:
The total momentum of the system is conserved but the total kinetic energy decreases.
8.22. Set Up:
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This note was uploaded on 04/28/2008 for the course PHYS 111 taught by Professor Bougie during the Spring '08 term at Loyola Chicago.
 Spring '08
 BOUGIE
 Physics, Momentum

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