# 10 Differences Between Speed And Velocity

## This is one of those unique dynamics in natural science, just as distance and displacement have particularly different meanings irrespective of obvious similarities; the same applies to speed and velocity Speed is a scalar quantity that refers to “how fast an object is moving.” Velocity is a vector quantity that determines “In which direction an object is moving”?

## Speed

The speed indicates the relationship between the distance traveled by an object and the time that this used to cover it. So, therefore, it can be measured in meters, kilometers, miles, or knots (in the water environment), per hour, or per second.

Since speed is expressed according to distance and time, it is characterized by being a scalar quantity, which means that only numerical units are used to describe speed. Since speed implies covering a distance during a time interval, it can only give a positive value.

​ The most common way to calculate the constant velocity of an object moving in a straight line is the formula: r = d / t

where

r: is the rate, or speed (sometimes denoted as v, for velocity)

d: is the distance moved

t: is the time it takes to complete the movement

## Velocity

Velocity is a vector quantity that refers to “the rate at which an object changes its position.” Imagine a person moving rapidly – one step forward and one step back – always returning to the original starting position. While this might result in a frenzy of activity, it would result in a zero velocity.

As the person always returns to the original position, the motion would never result in a change in position. Since velocity is defined as the rate at which the position changes, this motion results in zero velocity.

If a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. Every step must go into moving that person further from where he or she started. For certain, the person should never change directions and begin to return to the starting position.

Velocity is a vector quantity. As such, velocity is direction aware. When evaluating the velocity of an object, one must keep track of direction. It would not be enough to say that an object has a velocity of 55 mi/hr.

One must include direction information in order to fully describe the velocity of the object. For instance, you must describe an object’s velocity as being 55 mi/hr, east. This is one of the essential differences between speed and velocity. Speed is a scalar quantity and does not keep track of direction; velocity is a vector quantity and is direction aware.

## Notable Difference Between Speed And Velocity

1. Speed is the distance covered by a body in unit time.

2. Velocity is the displacement covered by a body in a unit time.

3. Both terms are used to refer to the relationship between the distance traveled and the time is taken to cover it.

4. Unlike speed, velocity accounts for both the rapidity and position of the object.

5. Even as, the velocity of moving Objects can be negative, positive, or can be zero. Speed cannot be negative.

6. Speed is the rate of change of distance while velocity is a rate of change of displacement.

7. Velocity determines “In which direction an object is moving”?

8. Both quantities are measured in m/s.