Explain that an object can accelerate when its direction changes.

Acceleration occurs not only when an object's speed increases but also when its direction changes. This is because acceleration is defined as the rate of change of velocity, which includes both speed and direction. For example, when a car turns a corner at a constant speed, its direction changes, resulting in a change in velocity. This change in direction means the car is accelerating, even if its speed remains constant. Understanding this concept is crucial in analyzing motion in various physical scenarios.