Date: Wed, 15 May 2002 08:32:58 -0400

Author: James Frysinger

Subject: Re: Inertia Ball



I've done that in the past with a 1 kg lab weight and cotton kite
string. Under the weight, on the floor, I placed a small pillow for it
to land on. First I yanked the lower string, which of course broke.
After replacing it, I pulled slowly on the lower string and the upper
string broke. Moving my hand quickly out of the way, I let the weight
fall to the pillow.

I've had great luck with repeatability on this demo.


On Wednesday, May 15, 2002, at 08:12 AM, George M. Caplan wrote:

> I will be doing a demonstration for alumnae soon.
> I plan to do an inertia ball demonstration. i.e. I plan to tie
> two strings to a weight and hang the weight by one of them.
> If I pull slowly on the bottom one, the upper one
> breaks. If I pull quickly, the lower one breaks.
> Do any of you know of any videos (especially high speed videos) of this?
> Also, can you suggest any related demos?