This is a tricky one because it seems counterintuitive! Acceleration is usually associated with a change in speed, but technically, it's a change in velocity.

Here's a situation where an object accelerates without changing its speed:

An object moving in a circle at a constant speed.

* Why it accelerates: Acceleration is defined as the rate of change of velocity. Velocity is a vector quantity, meaning it has both magnitude (speed) and direction. When an object moves in a circle, its direction is constantly changing, even if its speed remains the same. This change in direction means the object's velocity is changing, and therefore it is accelerating.

* Example: Think of a car driving around a roundabout at a constant speed. The car's speed doesn't change, but it's constantly changing direction, causing it to accelerate.

Let me know if you'd like another example!