* Velocity is a vector quantity, meaning it has both magnitude (speed) and direction.
* Speed is a scalar quantity, meaning it only has magnitude (how fast something is moving).
Therefore, if the speed of an object changes, its velocity also changes because the magnitude (speed) component of the velocity vector has changed.
Example:
* A car traveling at 60 mph east has a velocity of 60 mph east.
* If the car speeds up to 70 mph east, its velocity changes to 70 mph east. Even though the direction remains the same, the speed has changed, altering the velocity.
However, there's a nuance:
* If the object only changes direction, its velocity still changes even if its speed remains constant. This is because the direction component of the velocity vector has changed.
In summary:
* A change in speed *always* results in a change in velocity.
* A change in direction *also* results in a change in velocity, even if speed remains constant.
