Abstract
A new rolling apparatus known as the spiderwheel is described, which allows for large changes in mass distribution (and hence moment of inertia) without anything being added to or removed from the body. A quantitative analysis of the rolling spiderwheel motion allows students to determine its moment of inertia and compare it with model systems such as a rotating point mass, a solid cylinder, and a thin rigid hoop. Despite the spiderwheel's complex geometry and multiple components, a simple point-mass model provides an excellent approximation.
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