Moment of inertia matrix or axis moment of a region
MomentOfInertia[reg, pt, v]
MomentOfInertia[reg]
MomentOfInertia[reg, pt]
MomentOfInertia[Ball[]]
→ {{(8*Pi)/15, 0, 0}, {0, (8*Pi)/15, 0}, {0, 0, (8*Pi)/15}}ℐ = MomentOfInertia[Ball[], {1, 1, 0}]
→ {{(28*Pi)/15, (-4*Pi)/3, 0}, {(-4*Pi)/3, (28*Pi)/15, 0}, {0, 0, (16*Pi)/5}}MomentOfInertia[Ball[], {1, 1, 0}, {0, 0, 1}]
→ (16*Pi)/5