[Phys-L] Re: Science "Magic" Demos

[Herb Gottlieb <herbgottlieb@JUNO.COM>]

Here's and oldie demo that's sure to wow them:

Instead of using a screen to view a projected image
rapidly wave a long thin stick in the air along the
focal plane.  The persistance of vision of your
eyes will see the image reflected from the stick.

This is 1) entertaining  2) Educational 3) and very easy to perform.

Herb Gottlieb From New York City
(The home of science magic favorites)



On Tue, 27 Sep 2005 16:00:41 -0500 "Folkerts, Timothy J"
<FolkertsT@BARTONCCC.EDU> writes:
> I volunteered to give a ~ 50 min presentation on "science magic" to
> ~20-30 high school students in about 3 weeks and was hoping some
> people
> here had some favorites they might like to share.  Hopefully the
> demos
> will be 1) entertaining, 2) educational, 3) low budget and 4) not
> too
> difficult to perform.  I plan to present a brief explanation of
> each
> feat, but no really involved derivations or anything like that.
>
> Some current ideas include
> 1) bed of nails (I'd have to build one soon)
> 2) string tied above & below a heavy weight (slow pull breaks top
> string, quick tug breaks bottom string.
> 3) cabbage juice pH indicator.
> 4) juggling on a force plate (showing that the average force is the
> same
> whether juggling or not)
> 5) Bernoulli ping pong ball suspended on a stream of air.
> 6) cooling & crushing a container full of steam
>
> Do these sound reasonable?  Any other ideas?  Links to website with
> similar info?  I don't think these will take 10 min each, so I need
> a
> few more!
>
> Thanks in advance.
>
> Tim Folkerts
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