---
tag: 08ANASGBXV
kind: concept
name: Moment of inertia
aliases: [rotational-inertia]
msc: [26B15, "70E15"]
uses: [0698M7C7AX]
sources:
  - url: https://en.wikipedia.org/wiki/Moment_of_inertia
    locator: Definition
same_as:
  wikidata: Q165618
  wikipedia: Moment of inertia
---

## Summary

The moment of inertia of a body about an axis measures how hard it is to change the rotation of the body about that axis.
It is the integral of the density times the square of the distance to the axis. So for a solid body it is a [[triple integral|0698M7C7AX]].