vibrations and waves for the health science major mark w. plano clark doane college february 2002...
TRANSCRIPT
![Page 1: Vibrations and Waves for the Health Science Major Mark W. Plano Clark Doane College February 2002 Supported in part by NSF DUE0088712](https://reader036.vdocuments.net/reader036/viewer/2022083009/5697bf771a28abf838c818bb/html5/thumbnails/1.jpg)
Vibrations and Waves for the Health Science Major
Mark W. Plano Clark
Doane College
February 2002Supported in part by NSF DUE0088712
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Overview• Develop an introductory physics curriculum
• Who: Health science majors
• Why: Students see little relevance to goals
• What: – Intrinsically motivating activities– interactive engagement– Problem solving strategy– Multimedia– Mathematical modeling
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Speech and Hearing
• Base the physics on the human body - the hook!
• Physics topics in this module: vibrations, waves, standing waves, Hooke’s Law, pressure, fluid flow, Bernoulli's principle
• Emphasize mathematical modeling, problem solving, multimedia
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Motivation - The hook!
• Thanks Chris Wentworth and his nose!
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Exploration
• How does the human vocal system produce such amazing sounds?– Feel your throat while making the following
sounds• make soft sounds, loud sounds
• sing a high note, a low note
• say aaah, say eeeee
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Invention
• Study the properties of a simple larynx/pharynx model
• Make a loud sound, a soft sound
• Produce a high pitched sound, a low one
• Produce the same pitch with different levels of loudness
• What’s happening…?
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More Multimedia
• High speed digital video (DV) of vocal folds model
• Follow one point along the edge of the “vocal folds” - vibration
• Can we produce a simple mathematical model that approximates the motion?
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Vibrations - The Ruler
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Mathematical Model - SHO?
• Repetitive motion• Collect data using VideoPoint - more later!• Model the data in Excel• Introduce the simple harmonic oscillator
– x(t) = Asin(2ft)• How well did we do?
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Vibrating Ruler
-0.1
-0.05
0
0.05
0.1
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35
Time (s)
Am
pli
tud
e (
m)
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Conclusions - so far….
• Students definitely enjoyed manipulating the larynx model!
• Many experiments are standard physics experiments but more personal
• Investigators (well some) enjoyed discovering human applications