Physics
Length and Distance
The Difference Between

# Why is velocity a vector but speed is not?

Because velocity has a direction but speed does not. A vector has both a numerical value and a direction but a speed has only a numerical value and therefore it can't be represented by a vector.

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## Related Questions

"Speed" is a scalar; "velocity" is a vector.

Velocity is a vector. Speed is defined as the scalar component of velocity, so it's not a vector.

The size of the velocity vector is the speed.

Velocity is a vector, and so it has two components -- magnitude (speed) and direction. Speed is a scalar, and it is the magnitude of velocity, a vector.

Speed is a scalar, velocity is a vector. In other words, when a direction is important, you talk about velocity.Speed is a scalar, velocity is a vector. In other words, when a direction is important, you talk about velocity.Speed is a scalar, velocity is a vector. In other words, when a direction is important, you talk about velocity.Speed is a scalar, velocity is a vector. In other words, when a direction is important, you talk about velocity.

Velocity is a vector.Its magnitude is called 'speed'.

No. If you need a vector, you call it a "velocity".

velocity is speed with direction; velocity is a vector and speed is a scalar

Velocity is the vector form of speed. It is the speed of an object in a specified direction.

Speed is scalar (that is, without direction) and velocity is a vector (speed plus direction) by definition in physics.

speed is not a vector. Velocity is a vector. speed can also be used for angular velocity (which is a vector). Speed is sort of a catch all word that can cover all poorly defined velocities.

Speed is not a vector quantity, because it has no direction. When you combine speed with a direction, then you have a vector, called "velocity".

No. Velocity includes a direction vector, which speed does not have.

Velocity is defined as speed in a certain direction, or vector.

Velocity is a vector. It is characterized by its magnitude and direction. The magnitude of the velocity vector is the speed. Speed is only a numerical value, it has no direction. Velocity vector can be broken down into its components while speed, being just a number, has no components.

Velocity is an indication of a speed, including a direction. It is a vector because that is how a vector is defined (a magnitude, including a direction).

Velocity is a vector. The magnitude of the velocity - its absolute value - is its speed.

Speed is a scalar, velocity is a vector. In other words, when the direction of the speed is relevant, it is called a velocity.

No. A body with constant velocity is either stationary or going at constant speed in a constant direction. The usual interpretation of speed and velocity goes like this. A velocity is a vector with magnitude and direction. The magnitude is usually called its speed. Changing a speed must change the length of the vector and changing the length of the velocity vector has to change the velocity.

As used in physics, the two are different. Speed is a scalar, velocity a vector.

Why? Because that's the way speed and velocity are defined.

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