A bug of mass 10 kg is at rest on the edge of a solid cylindrical disk (M=100kg, R=2m) rotating in a horizontal plane around the vertical axis through its center. The disk is rotating at 2 rad/s. The bug crawls to the center of the disk. Angular velocity of the disk is w=1. What is the change in the kinetic energy of the system?

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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.