Lesson

Angular Kinetics - Moment of Inertia (MoI) and Angular Momentum

INERTIA is a body’s tendency to resist acceleration, and although not a measurable

quantity, it is proportional to a body’s mass.

MOMENT of INERTIA is simply inertia or resistance to ANGULAR ACCELERATION

It too is proportional to a body’s mass, but here the DISTRIBUTION OF THE BODY’S

MASS WITH RESPECT TO ITS AXIS OF ROTATION is even more important.

Eg.:

Swing a golf club from its grip end and from its head end. Which is easier? The latter.

WHY? The more closely a body’s mass is concentrated to its axis of rotation, the

easier it is to swing (rotate) it.

[  I=mr2 is the MoI of a single mass particle and I=mk2 for a body, with radius of

gyration, k, being the distance from the body’s axis of rotation to a point where the

body’s mass could be concentrated with respect to that axis ]

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