Date: Fri, 25 Oct 2002 23:21:53 -0400

Author: gnunes

Subject: Re: Rolling Objects and The Lecture Demonstration Workshop

Post:

Cliff Bettis wrote:
> You roll the objects
> down an incline after asking the audience to order them according to how
> fast they will go down it.

I did this only with a hollow cylinder (hoop) and a solid cylinder
(disk), but with the following "gotcha" twist. The hoop was 3/8" wall
brass---very heavy. The disk was polyethylene, very light. I would
hold them up, then place them on opposite arms of a balance, and only
then ask for the vote. They go for the heavy one every time....

-Geoff Nunes

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