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).