Date: Thu, 24 Oct 2002 15:44:59 -0500

Author: "Cliff Bettis"

Subject: Re: Rolling Objects and The Lecture Demonstration Workshop



It isn't complicated: just a cylinder, a ball, a ring, a cone, and a rod
all, with the help of some light weight discs, having the same rolling
radius; but it's visually very appealing and makes for very nice concept
questions. The objects I have all are 4 inches in rolling diameter and
except for the ball made of aluminum with plastic discs on the cone and rod
to give the proper rolling radius. The ball is a Bocce ball. Dale made his
ball of aluminum but my shop was going to charge me $600 for the ball alone
so I bought a set of Bocce balls and used one of them. You roll the objects
down an incline after asking the audience to order them according to how
fast they will go down it.

If you want me to I could send a picture.


----- Original Message -----
From: "Steve Wonnell"
Cc: "Steve Wonnell"
Sent: Thursday, October 24, 2002 2:41 PM
Subject: Re: Rolling Objects and The Lecture Demonstration Workshop

> Cliff,
> My excuse: I was busy helping out with the laboratory workshops and thus
> couldn't attend the lecture-demo workshop. Advertisement: The lab
> workshops were also very good and everyone learned quite a bit there too.
> Please attend if you can!
> So, what is this "Rolling Objects" demo that so tantalizes your folks?
> Steve W.
> On Thu, 24 Oct 2002, Cliff Bettis wrote:
> > Date: Thu, 24 Oct 2002 14:01:31 -0500
> > From: Cliff Bettis
> > Reply-To:
> > To:
> > Subject: Rolling Objects and The Lecture Demonstration Workshop
> >
> > I want to proudly announce the birth of a new demo here. I just got back
> > collection of rolling objects from the machine shop. I was inspired by
> > set I
> > saw Dale Stille show at the Boise Meeting during the Lecture
> > Workshop. Dale also gave me some advice on their construction. The set
> > used in class today for the first time and the Prof was very
> > about them (he's the dept. chairman, by the way, and during an era of
> > cuts, it doesn't hurt to impress the head guy!).
> >
> > It seems that every year I attend the Workshop, I come home with a
couple of
> > neat projects. I would encourage anyone no matter what your experience
is to
> > try to attend one of these workshops. I am sure you will find it as
> > rewarding a professional experience as I have.
> >
> > Cliff Bettis
> >
> >
> ************************************************************************
> Steven K. Wonnell
> Physics and Astronomy Department E-Mail:
> Johns Hopkins University Phone: (410) 516-4696, 516-5468
> 3400 N. Charles Street Fax: (410) 516-7239
> Baltimore, MD 21218-2686 Office: 478 Bloomberg
> ************************************************************************