Re: pinhole inertia demo

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From: pauld@exploratorium.edu
Date: Mon Nov 04 2002 - 14:46:31 PST 

Message-Id: <200211042246.gA4MkKa10409@isaac.exploratorium.edu>
From: pauld@exploratorium.edu
Subject: Re: pinhole inertia demo
Date: Mon, 4 Nov 2002 14:46:22 US/Pacific

Hi Marc

Use more hot melt glue (which is almost the same as "use a bigger hammer") to
attach the film can lid over the CD hole. Hole sizes in the 1/16" (1 mm)to 1/8"
(3mm) range work well.

Use a smooth surface or a larger hole.

Keep the balloon upright by using a toilet paper collar . If the balloon leans to
one side the CD edge will drag and create friction.

Here is my write-up
Paul D
http://www.exo.net/~pauld/activities/frictionless_cd_puck.html

> I am trying to make frictionless pucks using the famous PaulD
> adaptation of a sports bottle top/film canister top glued to a CD. So
> far no luck. I can't get it to float. Maybe I need a smaller
> balloon-more forc. I'm also having trouble getting the film can top
> to hot glue to the CD.Any suggetions?
> How big should the hole be?
>
> Also. Do you have any suggestions re. collisions. I'm thinking
> creating some bumpers out of bits on manilla folder but i'm cautious
> of the added weight.
>
> help. I want to do this activity later this week.
>
> marc
>
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