what is speed

Velocity is a physical magnitude that expresses the relationship between the space covered by an object, the time taken to do so, and its direction.

Because velocity also considers the direction in which the displacement of an object occurs, it is considered a magnitude of a vector character.

Thus, the speed implies the change of position of an object in space within a certain amount of time, that is, the speed, plus the direction in which said movement occurs. Hence velocity and speed are not the same.

Its unit in the International System of Units is the meter per second (m/s), and it includes the direction of displacement.

Galileo Galilei was the first to scientifically formulate the concept of speed by studying the movement of bodies on an inclined plane, dividing the distance traveled by an object into units of time. Thus, he devised the concept of speed, which is nothing more than a variation of the distance traveled per unit of time.

On the other hand, as speed we also call the lightness or promptness in movement. For example: “The speed with which you have come is impressive.”

For its part, in mechanics it is called walking speedthat is, to each of the motor positions of a motor vehicle.

See also Magnitude.

Difference Between Velocity and Quickness

Both velocity and speed are considered physical quantities. However, while the speed is determined based on the relationship between the space traveled by an object, the travel time and the direction, the speed only evaluates the relationship between the distance and the time. This means that speed is a vector magnitude and speed is a scalar magnitude.

See also Speed.

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Average speed

The average speed, also called average speed, is the quotient of the space covered by an object between the time it takes to cover the trajectory.

instant speed

The instantaneous speed is that at which an object moves at a given moment and point of its trajectory.

Constant velocity

Constant velocity is the velocity an object has when moving in a constant direction, with a constant speed, for a certain amount of time. Any change of direction will also mean variations in speed.

Angular velocity

Angular velocity is the measure of how quickly a rotational motion occurs. As such, it expresses the angle described in the unit of time by the radius of a body that rotates around an axis. Hence it is not a velocity in the sense described above.

See also Displacement and Force.