Rotational Inertia: The Race Between a Ring and a Disc
Why Physics Stack Exchange recommends it
Physics Stack Exchange users link it as a quick visual of how mass distribution changes rotational motion and as an example of a rotating experimental setup.
Recommended by 1 people across 1 different months, 2016 to 2021.
What it is
A short demonstration from the North Carolina School of Science and Mathematics showing a ring and a disc rolling down an incline to illustrate rotational inertia. It is part of the school's online physics collection and is aimed at high school students.
What people said
Recommends Tobias Hermann · 2021-08 · Physics Stack Exchange · on “Speed resulting from tangentially applying force to solid spheres with different mass distributions”
@Peter Yes! :) And to have a visualization of this effect at hand for future readers of this thread, here is a link to a video showing it: [this video]
Cites Michael Seifert · 2016-12 · Physics Stack Exchange · on “Internal mass distribution in a sphere”
A non-uniform mass distribution would affect the center of mass of the sphere as well as its moment of inertia. An object resting on a flat surface will in general have its minimum potential energy when its center of mass is closest to the surface. For a sphere with uniform density, this doesn't make a difference; the center of mass is at the center of the sphere, and so the actual orientation of the sphere doesn't make a difference. But for a sphere composed of two hemispheres of different density, the center of mass would be shifted towards the more massive hemisphere, along the line orthogonal to the "glued" faces of the hemispheres. This would mean that a sphere composed this way, if rol
Cites Space Thoughts · 2020-02 · Physics Stack Exchange · on “Stable Rotation Setup for Experiments (table version)”
I am looking for a rotation devise like that one in this video below (from 00:40 seconds). Does anyone know where to get one, or have any idea about how to create a nice and stable rotation setup for experiments without too much hassle and DIY? [this video]