The moment of inertia, otherwise known as the mass moment of inertia, angular/rotational mass, second moment of mass, or most accurately, rotational inertia, of a rigid body is defined relative to a rotational axis.

The moment of inertia, denoted by I, measures the extent to which an object resists rotational acceleration about a particular axis; it is the rotational analogue to mass (which determines an object's resistance to linear acceleration).

In this subsection, we show how to calculate the moment of inertia for several standard types of objects, as well as how to use known moments of inertia to find the moment of inertia for a shifted axis or for a compound object.

2025年1月18日 · Moment of inertia, in physics, quantitative measure of the rotational inertia of a body—i.e., the opposition that the body exhibits to having its speed of rotation about an axis altered by the application of a torque (turning force).

What Is the Moment of Inertia? The moment of inertia is defined as the quantity expressed by the body resisting angular acceleration, which is the sum of the product of the mass of every particle with its square of the distance from the axis of rotation.

2024年5月23日 · Moment of Inertia is the tendency of a body in rotational motion which opposes the change in its rotational motion due to external forces. The Moment of Inertia behaves as angular mass and is called rotational inertia. Moment of Inertia is analogous to the mechanical Inertia of the body.

2024年8月14日 · The moment of inertia is a fundamental concept in rotational dynamics, providing a measure of an object’s resistance to changes in its rotational motion. By understanding and calculating the moment of inertia, we can better predict and control the behavior of rotating systems, making it an essential topic in physics and engineering. ...

2024年11月8日 · Learn about moment of inertia for A Level Physics. This revision note covers its definition, calculations, dependence on mass distribution, and worked examples.

The moment of inertia of an object is a determined measurement for a rigid body rotating around a fixed axis. The axis might be internal or external, and it can be fixed or not. However, the moment of inertia (I) is always described in relation to that axis.

Moment of inertia is the name given to rotational inertia, the rotational analog of mass for linear motion. It appears in the relationships for the dynamics of rotational motion. The moment of inertia must be specified with respect to a chosen axis of rotation.