Fwd: Pendulum physics -- 15 pendulums, longer in a line, show spurious casuality with remarkable wave dynamics, Ernst Mach 1867, 1:45 video: Rich Murray 2011.10.04

[Rich Murray-2]

Fwd: Pendulum physics -- 15 pendulums, longer in a line, show spurious
casuality with remarkable wave dynamics, Ernst Mach 1867, 1:45 video:
Rich Murray 2011.10.04

---------- Forwarded message ----------
From: John Garst <[hidden email]>
Date: Tue, Oct 4, 2011 at 12:49 PM
Subject: Pendulum physics
To: John Garst <[hidden email]>

Just neat!

JEG

http://sciencedemonstrations.fas.harvard.edu/icb/icb.do?keyword=k16940&pageid=icb.page80863&pageContentId=icb.pagecontent341734&state=maximize&view=view.do&viewParam_name=indepth.html#a_icb_pagecontent341734

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[Bruce Sherwood]

As it happens, my colleague in the development of GlowScript, David
Scherer, was intrigued by this dancing pendulums video and wrote a
GlowScript program to model this motion:

http://www.glowscript.org/#/user/GlowScriptDemos/folder/Examples/program/DancingPendulums

This works with browsers that support WebGL, which include current
versions of Chrome, Firefox, and Safari (but with Safari you need to
go to the Advanced section of Safari preferences and check "Show
Develop menu in menu bar", then on the Develop menu check "Enable
WebGL"). And you need a modern graphics card, that has GPUs (Graphics
Processing Units).

You can navigate the scene by dragging with the right button to rotate
the view (or hold down the Ctrl key, then drag) or by dragging with
both left and right buttons to zoom (or hold down the Alt key, then
drag, or use the mouse wheel).

Click on "Edit this program" to see the very short GlowScript program
that produces this 3D animation. For more information:

http://matterandinteractions.wordpress.com/2011/09/23/glowscript-3d-animations-in-a-browser/

Bruce

On Tue, Oct 4, 2011 at 6:25 PM, Rich Murray <[hidden email]> wrote:

> Fwd: Pendulum physics -- 15 pendulums, longer in a line, show spurious
> casuality with remarkable wave dynamics, Ernst Mach 1867, 1:45 video:
> Rich Murray 2011.10.04
>
> ---------- Forwarded message ----------
> From: John Garst <[hidden email]>
> Date: Tue, Oct 4, 2011 at 12:49 PM
> Subject: Pendulum physics
> To: John Garst <[hidden email]>
>
> Just neat!
>
> JEG
>
> http://sciencedemonstrations.fas.harvard.edu/icb/icb.do?keyword=k16940&pageid=icb.page80863&pageContentId=icb.pagecontent341734&state=maximize&view=view.do&viewParam_name=indepth.html#a_icb_pagecontent341734
>
> ============================================================
> FRIAM Applied Complexity Group listserv
> Meets Fridays 9a-11:30 at cafe at St. John's College
> lectures, archives, unsubscribe, maps at http://www.friam.org
>

============================================================
FRIAM Applied Complexity Group listserv
Meets Fridays 9a-11:30 at cafe at St. John's College
lectures, archives, unsubscribe, maps at http://www.friam.org

[Rich Murray-2]

Thanks, Bruce -- I notice when I make the view smaller, then I see all
balls as rotating counterclockwise, with the top violet end faster, as
a spinning spiral staircase becomes a double helix...

Rich Murray

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FRIAM Applied Complexity Group listserv
Meets Fridays 9a-11:30 at cafe at St. John's College
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