### Lesson

#### Angular Kinetics - Angular Momentum and Angular Impulse

ANGULAR MOMENTUM  (for a body made up of many segments) ABOUT A GIVEN

AXIS OF ROTATION, is the SUM of the angular momenta of individual segments

ANGULAR MOMENTUM

Can be CONSERVED OR it can be CHANGED in a SPECIFIC MANNER:

• Whenever GRAVITY is the ONLY acting EXTERNAL FORCE, angular momentum is CONSERVED (ie in all air-borne movements).
• When an external torque DOES ACT, it changes the amount of ANGULAR

MOMENTUM present in a system in a predictable manner.

CHANGE in ANGULAR MOMENTUM depends on:

MAGNITUDE of EXTERNAL TORQUE

DIRECTION of EXTERNAL TORQUE

LENGTH of TIME OVER WHICH TORQUE(S) ACT

Therefore, ANGULAR IMPULSE = t x t = DH

Angular Impulse can be changed SIGNIFICANTLY by a large torque acting over a short time interval OR a by a small torque over a large time interval.

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