We're going to look at a couple more demonstrations of rotational inertia. Now to review rotational inertia is the property of an object that deals with a resistance to a change in its state of rotational motion. We know that this depends upon the mass of the object and the way that mass is distributed from the axis of rotation. For the first demonstration, let's look at this aluminum disk. This has quite a bit of inertia because much of the mass is distributed far from the axis of rotation. We're going to put this in motion with the motor and let it spin while we're doing something else. It will take some time to spin down because of its large inertia or rotational inertia. I'll get this thing going. I'll let it spin up here for about five to ten seconds. I've turned the motor off now and now it's just slowing down. Now we'll slow down because there are frictions in the bearings. But it's going to take a while to do that because of its large rotational inertia. Well that's happening. Let's take a look at this demonstration right here. Here I've got two disks which have the same radii. One of them is an aluminum ring and the other is a piece of wood. Now if these have the same mass, they have the same inertia, but they don't have the same rotational inertia because that mass is distributed in a different way. For this the mass is distributed uniformly throughout. For the ring the mass is all distributed far from where the axis of rotation will be, which is going to be right through the center. This will have a greater rotational inertia than this wooden disk. What we're going to have them do is raise down this incline and the one with the greater rotational inertia will lose the race because it will have a greater resistance to a change in its state of rotational motion. Now right now the state of rotational motion of both objects is zero. They're not rotating. Once I remove the piece of wood one of them is going to rotate more quickly. Let's see which one that is. So the wooden disk rotated more quickly and won the race down the incline. That makes sense because we said that the metal ring had greater rotational inertia so there's a greater resistance to a change in its state of motion. It's going to have a smaller rotational acceleration as it goes down the plane. Let's take a look now at our disk. You can see that it's still turning. It's slowing down. It's almost stopped by now. But if we could make the friction in the brains much, much less, this could continue spending for a long period of time. If we made this a very large metallic disk, we could store a large amount of rotational energy in that disk and we could keep that energy stored for a long period of time. Such devices are called flywheels and they are used for exactly for that purpose for energy storage.