* Change in speed: The object is speeding up or slowing down.
* Change in direction: The object is changing its direction of motion, even if its speed remains constant.
Here's why:
Acceleration is a vector quantity, meaning it has both magnitude (amount) and direction.
* Magnitude: The magnitude of acceleration is how quickly the velocity is changing.
* Direction: The direction of acceleration is the same as the direction of the change in velocity.
Examples:
* A car speeding up on a highway is accelerating.
* A car slowing down to a stop is also accelerating, even though it's slowing down.
* A ball thrown in the air is accelerating because its direction of motion is constantly changing, even if its speed is decreasing as it goes up.
* A car turning a corner is accelerating because it's changing its direction, even if its speed remains constant.
In summary, acceleration is any change in velocity, whether it's a change in speed, a change in direction, or both.
