1
Announcements
December 1, 2009
1. If you have arranged to take the comprehensive makeup
on Dec. 9, send an email by Dec. 3 to “
ilovephysics
” with
the subject line “
makeup exam
” and list your excuse in
the body.
2. Last homework will be posted tomorrow—Due Tuesday
(Dec. 8) at 11:59 pm.
3. Next Tuesday class will be review and evaluation of me.
There will be no clicker points next Tuesday for the
review.
Chapter 13.113.3
Simple Harmonic Oscillators (SHOs)
The whole universe is composed of SHOs
What are they?
A system with energy sloshing between kinetic and potential
A system that can stretch and go back to original shape
A system with linear restoring force to original shape
Hooke’s Law gives the force
F = 
k
x
Hooke’s Law Applied to a Spring – Mass System
• When x is positive (to the right),
F is negative (to the left)
• When x = 0 (at equilibrium), F
is 0
• When x is negative (to the left),
F is positive (to the right)
Think about the
position
x
,
speed
v
, and
acceleration
a
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 Spring '09
 DUNNAM
 simple harmonic oscillators, Sho, linear restoring force, Wave motionWave velocity

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