### Lesson

#### Angular Kinetics - Angular Momentum

MOMENT OF INERTIA = Inertial property for rotational movement. THUS,

MoI is an IMPORTANT QUANTITY for ALL KINETIC QUANTITIES.

ANGULAR MOMENTUM = the QUANTITY OF ANGULAR MOTION a body possesses

Just as M=mv in linear motion,

H=Iw=mk2w (angular momentum = moment of inertia x angular velocity)

FACTORS AFFECTING a BODY’s ANGULAR MOMENTUM:

• Its mass
• The distribution of its mass with respect to its axis of rotation
• Its angular velocity

Relevance of the three factors:

No angular velocity = no angular momentum

Greater mass OR angular velocity = greater angular momentum

MOST IMPORTANT FACTOR is the DISTRIBUTION of MASS with respect to AXIS of ROTATION, as H is proportional to k2 (the square of the radius of gyration).

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