From: Tim/Joan Merrill (tmerrill@hotmail.com)
Date: Fri Nov 22 2002 - 20:04:39 PST
From: "Tim/Joan Merrill" <tmerrill@hotmail.com> Date: Sat, 23 Nov 2002 04:04:39 +0000 Message-ID: <F126DeWrMY0jaLHQZil00005577@hotmail.com>
Hi Shannon,
I have kids make accelerometers and one of the common themes is an
instrument using a liquid that sloshes backwards during acceleration. We
discuss that when the liquid sloshes back, there must be a force pushing
forward and an acceleration forward. Then I put a thin rectangular
transparent box of colored water on a record turntable. We review the
accelerometer behavior. then I turn on the turntable. The kids look at the
sloshed water and relatively quickly agree the force must be inward and
acceleration must also be inward. But I keep it turning for a long time to
reinforce the vision.
Good luck,
Tim Merrill
>
> >I am introducing centripetal force to my physics classes and I really
>want
> >some demonstrations that will stress the "center-seeking" centripetal
>force.
> > Some demonstrations that I have found so far seem to stress the
> >"centrifugal force." What can I do to clarify these two ideas. Also, I
>put
> >together the clear plastic tubing (used at the convection workshop) and
>spun
> >around in a circle. Am I correct in stating that this demonstration also
> >portrays the outward motion of the water? Any ideas would be appreciated.
> >Thanks,
> >Shannon McManus
> >
> >
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