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Here's one I haven't seen in the replies so far. Two large muscular
students pull on the ends of a long rope as hard as they can. A much
smaller student pulls up in the middle, achieving a surprising deflection.
Michael Burns-Kaurin
Spelman College
"Folkerts,
Timothy J" To: PHYS-L@LISTS.NAU.EDU
<FolkertsT@BARTON cc:
CCC.EDU> Subject: Science "Magic" Demos
Sent by: Forum
for Physics
Educators
<PHYS-L@list1.ucc
.nau.edu>
09/27/2005 05:00
PM
Please respond to
Forum for Physics
Educators
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