No, acceleration is not the change in distance per unit time. That definition describes velocity, not acceleration.

Here's the breakdown:

* Velocity: The change in distance per unit time. It tells you how fast an object is moving and in what direction.

* Acceleration: The change in velocity per unit time. It tells you how quickly the velocity of an object is changing.

Think of it this way:

* Velocity is how fast you're going.

* Acceleration is how quickly you're speeding up or slowing down.

Examples:

* Driving at a constant 60 mph has a constant velocity but zero acceleration.

* A car speeding up from 0 to 60 mph has a positive acceleration.

* A car slowing down to a stop has a negative acceleration (also called deceleration).

Let me know if you have any other questions!