For bodies constrained to rotate in a plane, it is sufficient to consi... - dofaq.co
moment of inertia

For bodies constrained to rotate in a plane, it is sufficient to consi...

wikipedia - 23 Aug 2015
For bodies constrained to rotate in a plane, it is sufficient to consider their moment of inertia about an axis perpendicular to the plane. For bodies free to rotate in three dimensions, their moments can be described by a symmetric 3 × 3 matrix; each body has a set of mutually perpendicular principal axes for which this matrix is diagonal and torques around the axes act independently of each other.

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