How does density affect the moment of inertia?
1 Answer
Assuming it is constant, not at all.
Consider, for example a uniform foam disk, the moment of inertia about the axis normal to its plane is proportional to the total mass and to the radius. I now squash the disk to make it thinner (i.e. the radius remain the same). Does the moment of inertia change? No, Does the density change? Yes.
