# The speed

## The speed can be defined simply as the speed with which is traversed by a given body space.

In physics, it is useful to introduce another concept, the average speed.

This dimension indicates the space covered in a time interval Δt divided by the time taken. Mathematically it can be represented as follows:

## Vm = Δx/Δt = (XF – XI) / (TF – TI)

L ’ units based on the international system (Yes) for speed is the meter per second (symbol: m/s) but it is often also used the variant kilometer on now (km/h).

To switch between all units ’ other ’ we will use the following transformation:

1 m/s = 1 m/1s = 0,001 km / 1s . 1h/1:00 = 0,001 km x 3600/ 1h =

## 3,6 km/h

You can then easily guess that to switch between MPs to mph will simply multiply the value for 3,6 While to switch from km/h to m/s, simply divide by 3,6.

## If the body in his bike does not make any change in velocity then applies the following utterance: a surge of says uniform motion (MRU) If the trajectory is a straight line and the speed is constant.

To represent and describe the motion of a body is necessary to bind every moment t a particular position x. To resolve this problem we will use three possible aid: the hourly chart, the graphic representation or hourly law.

The schedule of motion is simply the schematic representation of a particular body position and time values. In the graphical representation of time is the independent variable while the location will be dependent.

## The segments connecting the points Pi and Pf or P2i and P2f are the graphic representation of the average speed.

## The numeric value of the average speed in the graph is then given by the slope of the segment, or Δx/Δt.