Review for Exam 2
Wednesday 11/04/09
Please get out your calculators and clickers.
You can
also use your own formula sheet here (but not tonight).
Exam 2:
Chapters 7-13, 9:4-6
Tonight, 8-10 p.m.

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Consider the following forces:
A. Gravitational force
B. Kinetic friction force
C. Hooke’s law spring force
Which of these 3 forces are
conservative forces?
1.
A and B only
2.
A and C only
3.
B and C only
4.
A, B and C
Question: Ch. 7
Solution
±
Criteria for a conservative force:
1.
The indefinite integral
±
F
±
d
±
r
²
can be computed and does not
depend on the path the particle takes.
2.
The work done by the force only
depends on the initial and final
positions of the particle and not on the
path taken by the particle between the
initial and final positions.
3.
The net work done on a particle
going around a closed path is zero.
Forces A and C satisfy these criteria
but force B does not.