A measure of both the speed and direction of a moving object is called velocity.

Here's why:

* Speed tells us how fast an object is moving.

* Direction tells us which way the object is moving.

Velocity combines both of these aspects, giving us a complete picture of the object's motion.

For example:

* A car traveling at 60 mph is describing its speed.

* A car traveling at 60 mph north is describing its velocity.