Forces & Movement
An objects speed tells you how fast it is going. It is determined
by the distance traveled and the time taken to get there.
Average Speed (m/s) = Distance Traveled (m) / Time (s)
The average speed is measured in m/s. If you are given the
distance in kilometres, times by 1000 to convert the distance
Speed cameras use this equation to determine how fast a
vehicle is going. The camera takes two pictures a specific time
apart or a specific distance apart. It then works out the
distance traveled or time taken and can determine the speed of
The distance-time graph above shows the distance moved
from a particular point over a certain amount of time. The
time (in seconds) is plotted on the x-axis and the distance
(in meters) is plotted on the y-axis.
The gradient of the line shows the speed (in m/s). The steeper
the gradient, the higher the speed. A horizontal line means no
distance has been traveled, therefore, the speed is 0 m/s.