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The Digital World

Much of our everyday information is described in the form of a number.

For example:

• "It is 2 o'clock."
• "The temperature outside is 21 degrees C."
• "The car was traveling at 48 kilometers per hour."

It is easy to understand data in this form. However, it can get tedious when we are looking at how a quantity, such as the speed of a car, changes over a period of time.

The result would be something like this:

Time in seconds	Speed in kilometres per hour
0	0
10	15
20	21
30	25
40	22
50	20
60	16

You might wonder what happened at time 35 seconds?

Was it moving faster or slower than 25 km/h then?