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[Physltest] [Phys-L] Re: rolling down an incline



Herb,
Why not try the experiment and see?
I use two male-male pipe couples about ~5 cm long and ~2 cm in
diameter from the local hardware store (<$1). Stuff one with modeling
clay (free- the art teacher here is a very understanding person). Tilt
a board, line them up with a ruler, lift the ruler, and race them.
Note that the pipe couples are not true cylinders and have a
small tendency to race towards one side or the other of the board. I
store them in a zip-lok bag between usages, but I then don't really care
if the clay hardens.
Since the density of the clay is not the density of the pipe,
the problem is not quite a solid uniform cylinder racing a ring, but the
demo makes the point.

THO

Thomas O'Neill
Physics
Shenandoah Valley Governor's School

-----Original Message-----
From: Herbert H Gottlieb [mailto:herbgottlieb@JUNO.COM]
Sent: Monday, January 24, 2005 9:50 PM
To: PHYS-L@LISTS.NAU.EDU
Subject: rolling down an incline

A hollow brass pipe at rest is allowed to roll down
to the bottom of a gentle incline without slipping.

If the same pipe is then filled with a solid substance
and the procedure is repeated, will it reach the bottom
of the incline any faster?
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