Re: pinhole Re: Science Fair Ideas
From: John or Jan Lahr (johnjan@lahr.org)
Date: Fri Nov 05 2004 - 05:40:41 PST
Message-Id: <6.1.1.1.2.20041105062610.0244d2f8@mail.comcast.net>
Date: Fri, 05 Nov 2004 06:40:41 -0700
From: John or Jan Lahr <johnjan@lahr.org>
Subject: Re: pinhole Re: Science Fair Ideas
One possibility would be to build models of various types of
pendulums.
We usually think of a mass on the end of a string (simple pendulum), but
there
are many other styles of pendulum. For seismologists, the goal is
to have a
compact pendulum that has such a long period that a very, very tall
simple
pendulum would be required. I've described a few of these on my
web
site:
Folded pendulum:
http://jclahr.com/science/psn/folded/
Inverted pendulum:
http://jclahr.com/science/psn/inverted/
Another "folded" design:
http://jclahr.com/science/psn/romberg/
Swinging gate horizontal pendulum:
http://jclahr.com/science/psn/hard_drive/
A physical pendulum is another type of pendulum with a long
period, but it isn't used in seismology because its response to
ground vibrations is poor.
The student could just work on pendulum designs, or if
interested, go ahead an build a working seismic sensor.
Cheers,
John Lahr
At 04:18 PM 11/4/2004, you wrote:
I feel odd asking but I need
some topic ideas for a boy who wnats to do a physics based project in the
science fair. He said something about wanting to do a
pendulum-based project but I feel like all the equations are known so why
do a project on something so well described already. Any
ideas?
Charlie Bissell
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