Inertia Kit Variable Distribution of Mass. Instantly change the distribution of mass. Compare which is faster the mass in middle or on the outer?? Two circular Discs same size. Ball bearings same size & weight can be inserted in various positions within the discs (towards the middle or outside edge). Roll discs down ramp comparing speed etc

Have students handle the closed disks. Roll both down slope in a 'race' and get them to explain what might be inside making the difference.