A shape's principal axes of inertia as a frame at its centre of mass: the direction is the axis
the shape turns about most easily, the normal the axis it resists most. The moments are about the
direction, the frame's y axis and the normal, in that order, for a density of 1.
A shape's principal axes of inertia as a frame at its centre of mass: the direction is the axis the shape turns about most easily, the normal the axis it resists most. The moments are about the direction, the frame's y axis and the normal, in that order, for a density of 1.