* Velocity is a vector quantity: This means velocity has both magnitude (speed) and direction.
* Speed vs. Velocity:
* Speed tells you how fast something is moving.
* Velocity tells you how fast something is moving *and* in what direction.
Examples:
* Car on a straight road: If a car is traveling at a constant speed of 50 mph east, its velocity is 50 mph east. If it then changes direction and travels north at 50 mph, its velocity has changed even though its speed remains the same.
* Object in a circle: An object moving in a circle at a constant speed still has a changing velocity because its direction is constantly changing.
Key takeaway: Even if an object's speed is constant, any change in direction means its velocity changes.
