Definition of moment of inertia
Moment of Inertia is a measure of the inertia (the characteristic that a rotating object maintains its uniform circular motion or rest) when the rigid body rotates around the axis, and is represented by the letter I or J. In classical mechanics, the moment of inertia (also known as mass moment of inertia, referred to as the moment of inertia) is usually expressed as I or J, and the SI unit is kg·m2. For a particle, I = mr2, where m is its mass and r is the vertical distance of the particle and the axis of rotation. The role of moment of inertia in rotational dynamics is equivalent to the mass in linear dynamics, which can be understood formally as the inertia of an object for rotational motion, used to establish angular momentum, angular velocity, moment and angular acceleration. relationship.