![Moment of inertia of a circle composite](https://kumkoniak.com/116.png)
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The moment of inertia of the semicircle is generally expressed as I = πr 4 / 4 Similarly larger the moment of inertia of the body more difficult is to stop its rotational motion. For example, if the body is at rest the larger the moment of inertia of the body the more difficult it is to put the body into the rotational motion. In other words, the moment of inertia is the measurement of resistance of the body to a change in its rotational motion. The moment of inertia plays the same role in rotational motion as the mass does in the translational motion.
![Moment of inertia of a circle composite](https://kumkoniak.com/116.png)