[SML] OT: Everything You Know About Faraday Cages Is Wrong

[JIM VOGEL]

Is this the same article?

http://www.upscale.utoronto.ca/Practicals/Modules/Measurement/AJP_Newtons_Cradle.pdf



From: Stagecraft [mailto:stagecraft-bounces at theatrical.net] On Behalf Of Phil Haney via Stagecraft
Sent: Thursday, August 04, 2016 2:46 PM
To: Joe D <jdunfee12 at yahoo.com>; Stagecraft Mailing List <stagecraft at theatrical.net>
Cc: Phil Haney <leadflyman at gmail.com>
Subject: Re: [SML] OT: Everything You Know About Faraday Cages Is Wrong


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Poop

-Phil

"Quini, quidi, quici" - I came, I saw, I played a little quidditch.


On Tue, Aug 2, 2016 at 8:13 AM, Joe D via Stagecraft <stagecraft at theatrical.net<mailto:stagecraft at theatrical.net>> wrote:
Here is an example of something that is ALWAYS explained incorrectly, or at least incompletely. The "Newton's Cradle" toy, which has a set of 5 metal balls hanging on thread.  Over my career, starting I think in elementary school, I had puzzled how the metal balls "know" the number of balls that were swung up at the start of the action.  The stock answer I was always given, and always read, was that "for every action there is an opposite, but equal reaction."  This may explain the total energy, but does not explain how the number of balls is maintained.  Why not shoot one ball up, with double the force, if two balls start the action?

I had asked several  instructors, including those with doctoral degrees in physics, and always got the same stock answer.  As a young person, I figured that since I could not wrap my head around this problem, I must not have the right mind-set to be able to understand physics.  I think this, along with my dislike for boring math classes, is what dissuaded me from getting involved with engineering when I was younger.

I realize now, that my intuition about Newton's Cradle was correct, and my instructors were wrong.  Also, math was boring, because I had grown up at a time when schools were dumbing-down their instructional goals to help address the issues race equality.  I.e. like the socialist economic goal of making everyone equal, by making everyone poor.

I realize now that I actually have an excellent aptitude for physics.  The Internet has really provided a great resource for educating oneself, if you can wade through the garbage.  Here is one treatment that addresses the elasticity of the balls, and how they contribute to the number of balls being preserved through the collisions. (note that, in spite of my aptitude towards physics, my educational background is not sufficient to follow all of the paper)
http://www.maths.tcd.ie/~garyd/Publications/Delaney_2004_AmJPhys_Rocking_Newtons_Cradle.pdf

-Joe Dunfee

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