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Prolab Scientific

Physics

Force

Variable Inertia Kit, Diameter: 3½''

Printable version

Variable Inertia Kit, Diameter: 3½''

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Now you don't need a PhD or mechanical aptitude to make rotational inertia make sense. Instantly change the distribution of mass in these 3½" diameter discs. Simply slip up to 8 solid steel balls into your choice of compartments inside. Replace the top, screw both halves together, and roll the weighted disc down a slope. We provide two complete discs so you can compare the speed as they roll.