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2007 - Week 1.2. Some Fundamental Items from PHYSICS. Assignment-. Begin reading the Background Notes that are posted on the website. Roughly pages 1-18. From Our Discussion. Elements of Music Structured/Designed Sound Some pleasant – bells, most musical instruments Some nasty – whip

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2007 week 1 2

2007 - Week 1.2

Some Fundamental Items from

PHYSICS


Assignment
Assignment-

  • Begin reading the Background Notes that are posted on the website.

  • Roughly pages 1-18


From our discussion
From Our Discussion

  • Elements of Music

    • Structured/Designed Sound

      • Some pleasant – bells, most musical instruments

      • Some nasty – whip

      • Some intermediate - drums

    • Rhythm (time)

    • Tones (Not defined, though)

    • Loudness

    • Pleasurable ????

    • Message ???? Must there be one? What Kind?


Bone flute music is older than i am
Bone Flute – Music is older than I am!

50,000 years or more

Neanderthal

reconstructions




Lightening
Lightening

  • Takes time to get to you or you are in big trouble.

    • Speed = distance/time

    • What is distance?

    • What is time?



Important definitions
Important Definitions

  • Length or Distance

    • How “far” something moves or travels.

    • Measured against some agreed upon standard.

Length Standard .. The Gorf

1 2 3 4 1/8

= 4 1/8 Gorfs

Unknown Length



Systems of units
Systems of Units

  • SI Units …. Meters, Seconds, Newtons/Kilograms

  • English System ….. Feet/yards, seconds, pounds/poundals


More important definitions
More Important Definitions

  • TIME

    • The subjective “distance” between two EVENTS.

      • It needs to be objective … ie measurable and reproducible.

    • Original Clock – The Earth’s Rotation

      • “It is two days journey”

    • Today’s Clocks –

      • “He ran the race in 4 hours, 2 minutes and 21.85 seconds”


Things that tick at some rate
Things that “tick” at some rate

  • The planet … once a day

  • The Pendulum .. Depends on a number of things;

  • Parameters:

Mounting

Length

Weight,

whatever

that is.


In case you care
In case you care…..

We will discuss this “g-thing” when we

get to acceleration.




And so on
And so on …

Rolex (~$10K) Atomic Clock (NASA) $ megabucks


The music clock the metronome
The music clock: the Metronome

112 quarter notes per minute.

Tempo

Kind of

Pendulum



And you didn t even know that you have one
And you didn’t even know that you have one!

Sound Waves push against

your

TympanicMembrane

What is a wave, what is a push??


Inside your head

D

d

Inside your head

To Brain


In order to understand musical tones and their relationship to each other we need to understand

In order to understand musical tones and their relationship to each other, we need to understand

GRAPHS!


A graph what does it all mean

100 to each other, we need to understand

snail

distance (meters)

50

rabbit

1

2

time (seconds)

A graph … what does it all mean?


Speed
Speed to each other, we need to understand


100 to each other, we need to understand

snail

distance (meters)

50

rabbit

1

2

time (seconds)

So….

Snail goes 100 meters in

2 seconds …

Speed=100m/2s

Speed = 2 meters/second


Notice
Notice to each other, we need to understand


Also to each other, we need to understand

  • Velocity is speed in a particular direction.

  • Velocity: 120 m/hr NORTH

  • Speed: 120 m/hr (or mph)


Example
Example to each other, we need to understand

  • Sound travels about 1100 ft per second.

  • How much time does it take for sound to travel about 1 mile?


Another graph a biggy

1.5 to each other, we need to understand

1

0.5

0

disturbance

0

5

10

15

20

25

-0.5

-1

-1.5

Time (seconds)

Another Graph .. a biggy!


Important definitions1
Important Definitions to each other, we need to understand

The PERIOD, T is the time it takes to go from one condition to the next time that exact condition is repeated.

The frequency, the number of oscillations per second, is given by:


1.5 to each other, we need to understand

1

0.5

disturbance

0

0

5

10

15

20

25

-0.5

-1

-1.5

Time (seconds)

Period = 6 seconds

Frequency=1/6 per sec (Hz)

=0.16 sec = 160 ms

6 sec


Siren a scientific instrument
Siren … a scientific instrument to each other, we need to understand


The graph
The Graph to each other, we need to understand


100 bottles of beer on the wall
100 Bottles of beer on the wall … to each other, we need to understand


Resonance later
Resonance (later) to each other, we need to understand

Loudness

Rotational Speed

(Turns/second)


Helmholtz resonators
Helmholtz Resonators to each other, we need to understand


Piano to each other, we need to understand

Keyboard


Helmholtz s results
Helmholtz’s Results to each other, we need to understand


Next ... to each other, we need to understand

Fun with Strings


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