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a i pe m
p u e p le
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- r o le
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3.
4. What You need to
Know
Energy
o Kinetic Energy
o Potential Energy
Amplitude
Frequency
5. Resonance
- Resonance is defined as the tendency of an object to oscillate
or vibrate at greater amplitudes when another sources emits a
frequency of the object
- To explain it in clearer terms we take the example of a child
on a swing
9. - Mechanical Resonance is a type of resonance that deals
with mechanical systems.
- A mechanical system is taken to mean a physical object.
- Bridges and other large structures are the perfect
examples to demonstrate Mechanical resonance.
10. Nimitz Freeway
Collapse
- A bridge that was located in San Francisco, California
- Collapsed in 1989
- The reason for collapse was an earthquake that struck the
city.
11. Soldiers on
Bridge
- Great story my teacher always used to bring up in high
school.
- Now soldiers don’t march in step while crossing a bridge
12. So why did it collapse?
One theory is that Another theory is
it collapsed due that it collapsed
to forced due to self-
resonance excitation (aero-
elastic flutter)
13. The problem was with the design of the bridge
The bridge was closed from the sides, thus blocking
the air from passing through
Engineers were able to figure this out and so it was
decided that when building bridges, the sides would
be kept open
14. Works Cited
Webdev17 (2009, March 2). Tacoma-Narrows Bridge construction & Collapse 1940 4 min.
Retrieved December 2, 2012. From:
http://www.youtube.com/watch?v=6AlSZT9k1ww
GonzoNugent (2006, September 28). Tacoma Narrows Bridge Collapse “Gallopin Gertie”.
Retrieved December 2, 2012From: http://www.youtube.com/watch?v=j-zczJXSxnw
Crowell Benjamin (2012). Light and Matter. n.d. n.d.pg 443-456. Retrieved from
http://www.lightandmatter.com/lm.pdf. Accessed on December 2, 2012. ( Statistical
data concerning Tacoma Narrows and Nimitz freeway was obtained from this
source)
K. Billah and R. Scanlan (1991).
"Resonance, Tacoma Narrows Bridge Failure, and Undergraduate Physic Textbooks"
(PDF). American Journal of Physics 59 (2): 118 124.
http://www.ketchum.org/billah/Billah-Scanlan.pdf Retrieved December 2, 2012.
(Statistical data concerning Tacoma Narrows was obtained from this source)
"Shattering wine glass." University of Salford Manchester. N.p., n.d. Web. 2 Dec.
2012. Retreived from
http://www.acoustics.salford.ac.uk/feschools/waves/wine1video.htm
