The figure below shows two disks that can rotate about their centers like a merry-go-round. At the time t = 0, the reference lines of the two disks have the same orientation. Disk A is already rotating, with a constant angular velocity of 8.9 rad/s. Disk B has been stationary but begins to rotate at a constant angular acceleration of 2.35 rad/s². Disk A Disk B (a) At what time t will the reference lines of the two disks momentarily have the same angular displacement 0? rad

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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.