Welcome to PHYS/MUS 102, Spring 2014
Today’s Schedule9-10:15(ish)
Syllabus + Intro StuffLecture: Simple Harmonic Motion
10:15(ish) – 10:30Quick stretch/restroom break.
10:30-11:00Intro to Lab Equip (meet in Howe 204).
11am-2 pmDo experiment (take lunch whenever you wish)
2-3 pmHelp with lab reports (optional)
Introductions
• Name • Hometown• Major and class year• Music background• What’s on your playlist at the
moment• One fun/random fact
Quotable Quotes
Life without playing music is inconceivable for me.
-Albert Einstein
Image credit: http://www.stumbleupon.com/stumbler/MamaJS/reviews/
Quotable Quotes
To stop the flow of music would be like the stopping of time itself, incredible and inconceivable.
-Aaron Copland
Questions to ponder:
• What is music?
• How would you define it in physical terms?
Sound waves/vibrations
Harmonic Analysis
It’s all in your head: psycho-acoustics
Pure listeningpleasure: Auditorium design
Ferris Wheel Problem
You and a friend are riding the Ferris wheel. How would you plot your height above the ground vs time as the ferris wheel turns? The wheel has a radius of 20m, and you complete one trip around the wheel every two minutes. Time (min)H
eigh
t (m
)
1 2 3 4 5
Oscillations/Simple Harmonic Motion
Period
time
Simple Harmonic Motion: Basic Definitions
A = amplitudeT = periodf = 1/T = frequencyx(t) = displacement/position as a
function of time
x(t)
Diving Board Oscillations
Analogy of diving board in musical setting = ?
Transient Decay
Musical note “dies out” Zoomed in (17 msec)
t
Decay time: where amplitude of signal drops to e-1of the max amplitude = ~37% of max amplitude
What’s all this got to do with music?!
• Answer: Everything
Lab Reports
• Introduction: what you are studying and why
• Methods: what you did and how it works-- theory and techniques described in detail
• Results: what you observed
• Discussion: what it all means