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2026-01-06T14:06:13Z

Article written and Venn diagram created.

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== Speed vs. Velocity ==
In kinematics, speed and velocity are distinct concepts used to describe the motion of an object.<ref name="ref1" /><ref name="ref2" /> Speed is a scalar quantity that indicates how fast an object is moving.<ref name="ref1" /><ref name="ref3" /> Velocity, on the other hand, is a vector quantity that describes both the object's speed and its direction of motion.<ref name="ref1" /> While the terms are often used interchangeably in everyday language, they have different scientific definitions.<ref name="ref4" />

An object's average speed is calculated by dividing the total distance traveled by the elapsed time.<ref name="ref5" /> In contrast, average velocity is determined by dividing the displacement (the change in position from the starting point to the ending point) by the elapsed time.<ref name="ref4" /> Because of this distinction, an object can have a high average speed over a journey but an average velocity of zero if it returns to its starting position.<ref name="ref1" /> For example, a car completing a lap on a circular racetrack may have a high average speed, but its average velocity for the lap is zero because its displacement is zero.<ref name="ref3" />

Instantaneous speed is the speed of an object at a particular moment in time, while instantaneous velocity is its speed in a specific direction at that instant.<ref name="ref1" /> The magnitude of the velocity vector is equal to the object's speed.

=== Comparison Table ===
{| class="wikitable"
|-
! Category !! Speed !! Velocity
|-
| '''Type of Quantity''' || Scalar<ref name="ref1" /> || Vector<ref name="ref1" />
|-
| '''Depends on Direction''' || No<ref name="ref1" /> || Yes<ref name="ref1" />
|-
| '''Related Physical Concept''' || Distance<ref name="ref1" /><ref name="ref5" /> || Displacement<ref name="ref4" /><ref name="ref5" />
|-
| '''Calculation (Average)''' || Total Distance ÷ Time <ref name="ref3" />|| Displacement ÷ Time
|-
| '''Possible Values''' || Always non-negative (zero or positive) |<ref name="ref1" />| Can be positive, negative, or zero
|-
| '''Example''' || A car is traveling at 60 km/h. |<ref name="ref3" />| A car is traveling at 60 km/h north.
|}

[[File:Venn_diagram_Differences_between_Speed_versus_Velocity_comparison.png|thumb|center|800px|alt=Venn diagram for Differences between Speed and Velocity|Venn diagram comparing Differences between Speed and Velocity]]

=== Scalar and Vector Nature ===
The primary difference between speed and velocity lies in their classification as scalar and vector quantities. A scalar quantity is fully described by its magnitude (a numerical value) alone. Speed, distance, and time are examples of scalar quantities.

A vector quantity requires both magnitude and a direction to be fully described. Velocity, displacement, and acceleration are examples of vector quantities. To specify an object's velocity, one must state its speed and the direction in which it is moving, such as "5 metres per second east." Simply stating "5 metres per second" describes the object's speed.

=== Distance and Displacement ===
The calculation of average speed involves the total distance an object travels, which is the total length of the path taken. For<ref name="ref1" /> instance, if a person walks 4 meters east and then 3 meters south, the total distance covered is 7 meters.

The calculation of average velocity, however, uses displacement. Displacement is the straight-line distance and direction from an object's starting point to its ending point. In<ref name="ref4" /> the previous example, the displacement would be 5 meters in a southeast direction. Because distance can be greater than or equal to the magnitude of the displacement, the calculated average speed will always be greater than or equal to the magnitude of the average velocity.

== References ==
<references>
<ref name="ref1">[https://www.physicsclassroom.com/class/1dkin/lesson-1/speed-and-velocity "physicsclassroom.com"]. Retrieved January 06, 2026.</ref>
<ref name="ref2">[https://www.britannica.com/story/whats-the-difference-between-speed-and-velocity "britannica.com"]. Retrieved January 06, 2026.</ref>
<ref name="ref3">[https://en.wikipedia.org/wiki/Speed "wikipedia.org"]. Retrieved January 06, 2026.</ref>
<ref name="ref4">[https://en.wikipedia.org/wiki/Velocity "wikipedia.org"]. Retrieved January 06, 2026.</ref>
<ref name="ref5">[https://www.ebsco.com/research-starters/science/velocity-vs-speed "ebsco.com"]. Retrieved January 06, 2026.</ref>
</references>

[[Category:Comparisons]]

Differences between Speed and Velocity - Revision history

Dwg: Article written and Venn diagram created.