A+25+0 Two disks, one weighted in center and other on rim, roll down ramp.
A+25+5 Moment of inertia: Hoop or disk rotated by falling weight.
A+25+10 Loop the loop: Sphere, hoop, disk rolled down a looped track.
A+25+15 Rotational Inertia Wands
A+25+25 Off center cross beam changes moment of inertia
