A disk of mass 3.8 kg and radius 45 cm with a small mass of 0.3 kg attached at the edge is rotating at 1.6 rev/s. The small mass, while attached to the disk, slides gradually to the center of the disk. What is the disk's final rotation rate?

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Angular speed, acceleration and displacement

Angular acceleration is defined as the rate of change in angular velocity with respect to time. It has both magnitude and direction. So, it is a vector quantity.

Angular Position

Before diving into angular position, one should understand the basics of position and its importance along with usage in day-to-day life. When one talks of position, it’s always relative with respect to some other object. For example, position of earth with respect to sun, position of school with respect to house, etc. Angular position is the rotational analogue of linear position.