I = ∑ i m i r i 2 = m 1 r 1 2 + m 2 r 2 2 +. Point mass is the basis for all other moments of inertia since any object can be "built up" from a collection of point masses. = 1 kg m 2 Moment of Inertia - Distributed Masses The Moment of Inertia with respect to rotation around the z-axis of a single mass of 1 kg distributed as a thin ring as indicated in the figure above, can be calculated as Make 3D models with the free Engineering ToolBox Sketchup Extension R = distance between axis and rotation mass (m, ft) Example - Moment of Inertia of a Single Mass I = moment of inertia ( kg m 2, slug ft 2, lb f fts 2)
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