* Constant Velocity: This refers to the disc spinning at a consistent angular speed. This means the disc completes the same number of rotations in a given time period.

* Speed: In the context of a rotating disc, we usually talk about angular speed (often represented by the Greek letter ω). This is the rate of change of the angle of rotation.

So, with constant velocity, the disc rotates at a constant angular speed.

Here are some important points to remember:

* Angular speed is measured in radians per second (rad/s) or revolutions per minute (RPM).

* Constant velocity doesn't mean the disc isn't moving. It just means the rate of rotation is steady.

Let me know if you have any more questions!