* Acceleration is a change in velocity. Velocity is a combination of speed and direction.
* Constant speed means no change in speed. Therefore, if the speed remains constant, there is no change in velocity.
* No change in velocity means no acceleration.
Example: Imagine a car driving on a perfectly straight highway at 60 mph. The car's speed is constant. However, if the car is moving in a straight line, its direction isn't changing either. Since both speed and direction are constant, the car's velocity is constant, and therefore it's not accelerating.
However, it's possible for an object to be moving at a constant speed but still experience acceleration if its direction is changing. This is called centripetal acceleration.
Example: A car driving in a circle at a constant speed is still accelerating because its direction is constantly changing. The car's velocity is changing even though its speed is not.
