The ball has a mass of 1 kg and is confined to move along the smooth vertical slot due to the rotation of the smooth arm OA. The rod is rotating with a constant angular velocitye = 2 rad/s. Assume the ball contacts only one side of the slot at any instant. Which one of the following is (are ) incorrect answers ? 0.5 m -2 rad Select one or more: There is only one contact force on the ball that is acting perpendicular to the rod. There are two contact forces on the ball: one is acting perpendicular to the wall, and the other is perpendicular to the rod. The path of the ball is given by r = 0.5 sec 0. The acceleration along the 0 increasing direction is a, = tan 6 sec 00 The normal reaction to the ball by the rod is given by the equation N=g cos + a, where ao is the acceleration along the 6 increasing direction.

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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.