Date: Tue, 7 Dec 2010 12:48:01 -

Author: Andrew Yue

Subject: Re: Rolling Disk, Ring and Sphere


Keith ,

My advice is don't sweat the different in masses with regards to the
sphere versus the ring and disc.

I just raced two spheres with the same mass, but different masses on
my inclined plane.

The both reached the bottom of the hill at the same time.

Next up I raced two different mass and diameter steel ball bearings.

Again, both reached the bottom of the hill at the same time.

Get a Bocci ball that is nearly the same diameter as most rolling
disc and rings.

>I have been looking for a sphere to go with our rolling disk and
>ring moment of inertia demo, but I'm having trouble finding one. I
>can find sets that include just the disk and the ring, and I can
>find sets that include just a solid sphere and a hollow sphere, but
>I can't find a set that includes all 4, or at least one of the
>spheres with the disk and ring. All of the objects need have the
>same mass and radius, so I can't just put two sets together. I
>would be appreciated any ideas.
>Keith Heyward
>NC State



Andrew Yue
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