* Acceleration is a vector: Acceleration is not just about speeding up or slowing down. It's about a change in *velocity*, and velocity has both magnitude (speed) and direction.
* Constant speed, changing direction: Even if an object's speed remains constant, a change in direction means its velocity vector is changing. Since acceleration is the rate of change of velocity, a change in direction implies acceleration.
Examples:
* Car turning a corner: A car traveling at a constant speed around a corner is accelerating because its direction is changing.
* Object in circular motion: An object moving in a circle at a constant speed is also accelerating because its direction is constantly changing.
Key takeaway: Acceleration is about changes in *velocity*, and velocity involves both speed and direction. So, any change in either speed or direction results in acceleration.
