According to Newton's second law, every acceleration is the result of a corresponding force, and hence the term centripetal force is often used. The acceleration required to keep the object on the circular path is called the centripetal acceleration and is directed towards the center of the circle. Therefore, the linear velocity, v, is not constant. Although the object's speed is constant, its direction of motion keeps changing, being always tangent to the circular path. When an object moves along a circle at constant speed, v, its angular velocity about the circle's center is also constant, and the object is said to move with uniform circular motion. More precisely, the angular velocity measures the rate of change of the angle formed between the lines joining the object's initial and final positions, respectively, to the center of rotation: When considering motion in three-dimensions, the center of rotation is no longer a point, but an axis. Angular velocity is a quantity representing how fast an object is moving around a given fixed point called the center of rotation.
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