Re: Generation of heat

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From: The Lahrs (johnjan@lahr.org)
Date: Fri Oct 26 2001 - 06:15:51 PDT 

Message-Id: <4.2.0.58.20011026070826.00b17de0@pop3.norton.antivirus>
Date: Fri, 26 Oct 2001 07:15:51 -0600
From: The Lahrs <johnjan@lahr.org>
Subject: Re: Generation of heat

There is a good demonstration that a collision generates heat. I have two
large ball bearings (1.5 inch diameter). If I strike them together with a
piece of paper in between, a hole is burned in the paper - at least that is
the explanation that I have been given for the small hole that appears.
The hole looks like it could be caused by the paper being pushed
aside and there is not a clear black ring of charred paper.

I've tried hitting a piece of heat sensitive paper and indeed the color
change does indicate that heat was generated.

Does anyone have an alternative mechanism to illustrate that
heat is produced by this collision? I have not tired "flash" paper,
but suspect that it would start burning.

Thanks,
John

>Subject: Generation of heat
>From: "Jhumki Basu" <sjbasu@hotmail.com>
>Date: Thu, 25 Oct 2001 16:12:41
>
>Hello!
>
>Can someone explain why contact or collision between objects produces heat?
>What's happening at a molecular level?
>
>Thanks,
>Jhumki Basu

* John C. and Jan H. Lahr
* JohnJan@lahr.org
* 1925 Foothills Road
* Golden, Colorado 80401-1718
* Phone: (303) 215-9913
* http://lahr.org/john-jan

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