Moment of Inertia
A measure of how difficult it is to change an object's rotational motion.
Moment of Inertia
Moment of inertia is the rotational analogue of mass — it depends on both the mass of an object and how that mass is distributed relative to the axis of rotation.
Radius of Gyration
The radius of gyration is the distance from the axis at which the entire mass could be assumed to be concentrated to give the same moment of inertia.
Lesson 15 of 31