The correct answer is option 2: a change in velocity due to a change in its direction of motion.

When an object moves along a circular path, its velocity is constantly changing because velocity is a vector quantity that includes both speed and direction. In uniform circular motion, the speed of the object remains constant, but the direction of its motion constantly changes as it moves around the circular path.

Velocity is defined as the rate of change of displacement with respect to time. Since the direction of motion changes in circular motion, the displacement of the object also changes. Therefore, the velocity of the object changes even though its speed remains constant.

It is important to note that momentum is a separate concept from velocity. Momentum is the product of an object`s mass and its velocity. In uniform circular motion, although the velocity is changing, the momentum of the object remains constant because there is no net external force acting on it. Therefore, option 3 (a change in momentum due to no change in its direction of motion) is incorrect.

In conclusion, option 2 accurately describes the change in motion experienced by a car moving along a circular path: a change in velocity due to a change in its direction of motion.