|A disk with moment of inertia I1 rotates about a frictionless, vertical axle with angular speed Wi. A second disk, this one having moment of inertia I2 and initially not rotating, drops onto the first disk (see figure below). Because of friction between the surfaces, the two eventually reach the same angular speed wf. (a) Calculate wf. (b) Calculate the ratio of the final to the initial rotational energy. Before After

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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.