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If a speed and direction is specified, it is called a velocity.
"velocity"
Velocity is a speed and its direction. -- "30 miles per hour" is a speed -- "30 miles per hour north" is a velocity -- "30 mph north" and "30 mph east" are equal speeds but different velocities.
Velocity :)
In physics, if both the speed and the direction are specified, the term "velocity" is used.
If a speed and direction is specified, it is called a velocity.
"velocity"
Velocity is a speed and its direction. -- "30 miles per hour" is a speed -- "30 miles per hour north" is a velocity -- "30 mph north" and "30 mph east" are equal speeds but different velocities.
Velocity :)
Velocity is the vector form of speed. It is the speed of an object in a specified direction.
In physics, if both the speed and the direction are specified, the term "velocity" is used.
Speed with direction is called Velocity
You have a velocity when both a speed and a direction is specified. This kind of magnitude is known as a "vector" - that is, when it is relevant to state a direction, as well as a magnitude, we speak about "vectors".
A scalar, since no direction is specified.
Speed is a scalar, velocity is a vector. That is to say, when you talk about "speed", the direction doesn't matter; when you talk about "velocity", it does. A velocity is only completely specified if you know the magnitude AND the direction.
Speed doesn't "become" velocity. Velocity is simply speed as a vector, meaning that not only the magnitude is specified (as in the speed), but also the direction.
Speed and direction is called velocity.