This is quite interesting: "Your ability to manipulate a phone is based primarily on its mass, but also on its moment of inertia. And since the reduction in ma

This is quite interesting: "Your ability to manipulate a phone is based primarily on its mass, but also on its moment of inertia. And since the reduction in mass when switching from stainless steel to titanium is occurring almost entirely at the perimeter of the phone, the moment of inertia should be reduced more than if the mass were reduced uniformly." Author goes on to actually compute the moment of inertia but that goes over my head. Intuitively though it seems right when I think about moving a heavy ball at the end of a rod vs. at the nearby end of the rod.