Answer :
The tangential component of acceleration is always zero.
The Tangential component of velocity is always negative.
Uniform circular motion can be defined as the motion of an object which is moving in a circular direction at a constant speed. As an object is moving in a circular direction, it is constantly changing its direction. At all points of its movement, the object is moving tangentially to the circle. Since the direction of the velocity vector is the same as the direction of the motion of the object, the velocity vector is also directed towards the tangent to the circle.
The net force is the last component of motion for an item moving in a smooth circular motion. Such an item is subject to a net force that is pointed in the direction of the circle's center. Thus, the centripetal force is referred to as the net force. Without the centripetal force, an item would always move in the same direction and stay in a straight line. However, because of the centripetal force's perpendicular direction to the velocity vector, the object is constantly changing its direction and accelerating inward.
So, during a uniform circular motion, tangential acceleration is zero due to its constant angular velocity.
The tangential unit vector points always in the same direction as the velocity: it is defined as the velocity vector divided by the magnitude of velocity. If the speed increases, the tangential acceleration is positive. In the case of decreasing speed, the tangential acceleration is negative.
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