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== Physics of Sound Demos ==
== Physics of Sound Demos ==


These are all just proposals. We're starting to try them out, one by one. Good topics: Periodic motion, the relationship between motion and sound, the frequency spectrum, resonance, harmony, etc.
Pippa and Morag have come up with a running order and logical flow of demos. We haven't included them all, but anything already built can be included in playtime at the end.


=== Airzooka + balloon curtain ===
Demonstrations of the Physics of Sound


See how far a pulse of air can travel, and how directional it is, shooting at a curtain of balloons hanging from the ceiling.
What is sound?  Think about what sound is?  How does sound move from one place to another?  Sound isn't a think in itself that moves, but is transmitted through a medium.
* Vibrations in air
** + Shout at a balloon, you can feel the vibrations
* Vibrations in a solid
** + Tin can string telephone


=== Tin cans and string: sound transmission ===
* Waves that move through something.  Not transverse, as in water waves,
** + Shake a slinky
* ... but waves of pressure
** + Shove a slinky


Speak around corners, through doors!
Stuff can move through air really well
* Does an airzooka fire a pressure wave or a packet of air?  Fill with something smelly to test!
* Demonstrate how well waves can move through air
** + Hang balloons from the ceiling so that they form a curtain to use as a target for airzooka practice


=== Ripple tank: waves, reflections etc ===
How sound moves through a space
* Demonstrate propagation of waves using a ripple tank, ideally, with tuneable wave generator
** Propagation of waves
** Diffusion
** Reflection
** Resonance (create constructive interference and make really big waves for the same input.
*Which frequency will resonate depends strongly on the size of your thing.  If it is right, it will interfere and be really strong, otherwise it will die away
** + Flappy thing on a handle.  Long vertical handle, which can be gripped at one end. Coming out of it at right angles, various lengths of something flexible (similar to thin metal rulers) stacked on top of each other. Shake at varying frequencies to make the different parts resonate.


Really want this one!  Demonstrate waves, transmission, diffusion, reflection, absorption?, interference.
* Tone, resonance in metal tubes - different tone is due to which size of note 'fits' in it best
** +Tuned tubes


Tension
* + Bucket bass
** [need decent explanation!]
Playtime!
==Demo archive==


=== Wine Glasses: Pitch ===
=== Wine Glasses: Pitch ===
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* "adhesive tape, jelly babies [really any kind of weight] and wooden skewers"
* "adhesive tape, jelly babies [really any kind of weight] and wooden skewers"


=== Slinky: Propagation ===
(artag put one in martind's box.)
* Lay it on a table, waggle the end, watch the wave perturbation propagate.
* Slinkies are great for demoing the difference between longitudinal and transverse waves.
* Also make a [http://bengoldacre.posterous.com/the-wave-pendulum wave pendulum]?


=== Glob Monster: Resonance ===
=== Glob Monster: Resonance ===
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Pics:
Pics:
* [http://www.flickr.com/search/?w=81282800@N00&q=younghackspace%20pipes A test run with a contact mic]
* [http://www.flickr.com/search/?w=81282800@N00&q=younghackspace%20pipes A test run with a contact mic]
=== Ruben's Tube: ?? ===
Fire! What could go wrong.
* http://en.wikipedia.org/wiki/Rubens'_tube
* SamLR said he might build one


=== Resonating Spring ===
=== Resonating Spring ===
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