Welcome to PHYS/MUS 102, Spring 2014. Today’s Schedule 9-10:15(ish) Syllabus + Intro Stuff Lecture: Simple Harmonic Motion 10:15(ish) – 10:30 Quick stretch/restroom.

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