* Velocity is a vector quantity, meaning it has both magnitude (speed) and direction.
* Change in velocity can occur in two ways:
* Change in speed: The object speeds up or slows down.
* Change in direction: The object changes its direction of motion, even if its speed remains constant.
Therefore, the following does NOT describe a change in velocity:
* Maintaining a constant speed in a straight line.
Examples of changes in velocity:
* A car accelerating from a stop sign.
* A ball rolling down a hill.
* A plane turning during flight.
* A satellite orbiting the Earth.
