text: between a hoop and a solid sphere of the same mass which object has higher rotational inertia when they are ro between a hoop and a solid sphere of the same mass which object has higher rotational inertia when they are rolled? hoop all the way. all of the mass in the hoop is moving at the same speed (roughly) while the inside of the sphere is moving much more slowly than the outside. so the hoop has more mass moving at a faster speed giving it a higher rotational inertia.