* Acceleration is the rate of change of velocity. This means that acceleration tells us how quickly the velocity of an object is changing.

* Velocity has both speed and direction. So, acceleration can change either the speed of the object, the direction of its motion, or both.

Here are some examples:

* A car speeding up: The car's velocity is increasing, so it is accelerating.

* A car slowing down: The car's velocity is decreasing, so it is also accelerating (in this case, we call it deceleration).

* A car turning a corner: Even if the car maintains a constant speed, its direction changes, meaning its velocity changes, and therefore it is accelerating.

Key points to remember:

* Acceleration requires a force. Newton's second law of motion states that force is equal to mass times acceleration (F = ma). This means that an object will only accelerate if a force is acting on it.

* Acceleration can be positive or negative. Positive acceleration means the velocity is increasing, while negative acceleration means the velocity is decreasing.

Let me know if you'd like to explore specific examples or have more questions about acceleration!