* Speed is a scalar quantity, meaning it only has magnitude (amount). It tells you how fast something is moving. For example, a car traveling at 60 mph has a speed of 60 mph.
* Velocity is a vector quantity, meaning it has both magnitude and direction. It tells you how fast something is moving *and* in what direction. For example, a car traveling at 60 mph east has a velocity of 60 mph east.
When can speed and velocity be the same?
They can be the same when the motion is in a straight line and the direction is not changing.
For example:
* A car traveling at 60 mph due north has a speed of 60 mph and a velocity of 60 mph north.
In summary:
* Speed is just how fast something is moving.
* Velocity is how fast something is moving *and* in what direction.
* They can be the same when the motion is in a straight line and the direction is constant.
