>Four objects with identical masses and radii racing down a plane while rolling without slipping. From back to front: spherical shell (red), solid sphere (orange), cylindrical ring (green) and solid cylinder (blue). The time for each object to reach the finishing line depends on their moment of inertia.

The solid sphere (orange) has the smallest moment of inertia, and the thin walled cylinder has the highest. In Layman’s terms the concentration of the mass about the object’s center of the mass impacts how easily it rotates. The solid sphere (most efficiently packed) has the least resistance to angular acceleration, while the thin walled cylinder (least efficiently) has the greatest resistance.

If you have anything to add (or if I’m way off base), please do so.

I made a [similar gif](http://i.imgur.com/H9aPwIN.gif) but added in a frictionless cube for comparison.

Also made an [interactive version](http://ophysics.com/r3.html) where you can adjust the incline angle.

From Wikipedia:

>Four objects with identical masses and radii racing down a plane while rolling without slipping. From back to front: spherical shell (red), solid sphere (orange), cylindrical ring (green) and solid cylinder (blue). The time for each object to reach the finishing line depends on their moment of inertia.

The solid sphere (orange) has the smallest moment of inertia, and the thin walled cylinder has the highest. In Layman’s terms the concentration of the mass about the object’s center of the mass impacts how easily it rotates. The solid sphere (most efficiently packed) has the least resistance to angular acceleration, while the thin walled cylinder (least efficiently) has the greatest resistance.

If you have anything to add (or if I’m way off base), please do so.

Edit: [Source](https://en.wikipedia.org/wiki/Moment_of_inertia)

So does that mean if the mass was centralized, with minimal weight in the shell, it would cross first?

Here is a video on the subject: https://youtu.be/cB8GNQuyMPc

How do you create these? Are these physics simulations?

What about at the bottom? Which one would roll the furthest and/or the fastest on a flat level surface, a la pine wood derby style?