(Text here is removed due to bad wording.)
To mrtksn: yeah I think your original post is pretty clear. But there are indeed other comments in this thread that are confusing the two.
To mrtksn: yeah I think your original post is pretty clear. But there are indeed other comments in this thread that are confusing the two.
In my mental model its wheels attached in different way that rotate around an axis perpendicular to the ground. I call in wheels because moves the things around.
I'm really confused by the confusion. Isn't it obvious on the video that its cylindrical objects that can be considered thick disks and wouldn't all disks rotate on the round surface around the axis?