# Why is speed classiﬁed as a scalar quantity and velocity classiﬁed as a vector quantity?

Jul 5, 2018

Speed has only magnitude and Velocity has both magnitude and direction.

#### Explanation:

We know,
By the definition of scalar quantity, they only have a magnitude and no definite direction.
Speed here does not have any specific direction and have only magnitude so is a scalar quantity.

Whereas Velocity is a vector quantity which can be specified both in the magnitude and direction.

Jul 5, 2018

Note similarities in characteristics below.

#### Explanation:

Scalar: magnitude but no direction. $\text{ }$Vector: magnitude and direction.

Speed: magnitude but no direction. #" "Velocity: magnitude and direction.

I hope this helps,
Steve