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When a rigid body is in translational motion, the resistance to a change in its linear motion is called the **mass **(also called inertia). When a rigid body is in rotational motion, the resistance to a change is called the **moment of inertia**.

The smaller it is, the easier it is to accelerate the rotation of the object.

Here you have the moment of inertia for the most important shapes.

**Click** on a shape to select it.

- To show that different positions of the axis result in different moments of inertia for the same object.