* Acceleration is the rate of change of velocity. This means that when acceleration changes, the velocity will also change, but not necessarily in a linear way.

* Direction matters: Acceleration can change the *magnitude* of velocity (how fast an object is moving) or the *direction* of velocity, or both.

Here are some scenarios:

* Constant acceleration: If acceleration is constant, velocity will change at a constant rate. For example, if a car accelerates at 5 m/s² (meters per second squared), its velocity will increase by 5 meters per second every second.

* Changing acceleration: If acceleration changes, velocity will change in a non-linear way. For example, a car accelerating quickly and then slowing down will have a velocity curve that isn't a straight line.

* Zero acceleration: If acceleration is zero, velocity remains constant. An object moving at a constant speed in a straight line has zero acceleration.

Examples:

* A car speeding up: The acceleration is in the same direction as the velocity, so the velocity increases.

* A car slowing down: The acceleration is in the opposite direction of the velocity, so the velocity decreases.

* A car turning: The acceleration is perpendicular to the velocity, causing a change in direction.

Key Points:

* Acceleration is the cause, velocity is the effect.

* The relationship is determined by the *magnitude* and *direction* of both acceleration and velocity.

* The change in velocity will depend on the duration of the acceleration change.

Let me know if you'd like a more specific example!