Constant Angular Velocity (CAV) refers to how information is written to or read from a rotating datadisk. A typical example can be seen in one of the differences between an LP record and a compact audio disc (CD). With an LP, the disc always spins at the same angular rate (CAV), so the surface of the record groove passes the needle at slower linear rate as the needle moves toward the center of the disc. Whereas, with a CD, the motor speed decreases as the read head moves away from the center to keep the disc moving past the read head at a constant linear velocity (CLV).
Angularvelocity is the rate of change of angular displacement and angular acceleration is the rate of change of angularvelocity.
The rotation equations represent a complete set of equations for constantangular acceleration rotations, but in certain types of problems, intermediate results must be calculated before proceeding to the final calculation.
In the example calculation, the time, initial angularvelocity, and displacement were considered given (primary) unless they were being calculated (e.g., in calculating a).
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