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Learner Guide

Forces & Movement

Motion:

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

to meters.

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 vehicle.

Distance-Time Graphs

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.

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