The forearm is used to accelerate a 1.2 kg ball by using the triceps muscle as shown in the figure. The forearm has a mass of 3.7 kg and rotates like a uniform rod about an axis at one end. The ball is accelerated uniformly from rest to 9.0 m/s in a time of 0.45 s, when it is released.    Part A Calculate the angular acceleration of the arm.       Part B Calculate the force that the triceps muscle must exert to provide the necessary acceleration in part A.

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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.