That's a great way to put it! Acceleration is the change in velocity of an object, and velocity includes both speed and direction.

Here's why:

* Speed refers to how fast an object is moving.

* Direction refers to which way the object is moving.

Acceleration occurs when either or both of these things change:

* Change in speed: A car speeding up or slowing down is accelerating.

* Change in direction: A car turning a corner, even if its speed remains constant, is accelerating because its direction is changing.

* Change in both speed and direction: A rocket launching into space is accelerating because both its speed and direction are changing.

Let me know if you have any other questions!