1. Independent Variables
Stage 4
Year 9
Graphs of
Physical
Phenomena
Dependant and
Independent Variables
Press Ctrl-A
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2. Independent Variables
are not affected by other variables
Time is an Independent Variable
(except for The Doctor)
Even for The Doctor, age is an
Independent Variable.
He’s 900 years old.

3. Dependent Variables are affected by other variables A persons height
and weight
are dependant variables.
They depend on your age,
the independent variable.
Your height and weight,
don’t affect your age!!!! 3

4. Independent Variables
Tables of Values
Independent Variables
Time
Height
go on the left
or top of
a table of values.
Time
Height
Dependent Variables
go on the right
or bottom of
a table of values. 4

5. Graphs Height Time The Dependent Variable always goes on the
vertical Axis
The Independent Variable
always goes on the
horizontal Axis
Dependent Variable
Independent Variable 5

6. Exercise Click on the independent variable.
Weight – Age  
Height – Time
Mass - Spring Length
Don’t Delete
Number of Hectares – Kilograms of Seed
Time – Interest
Number of Teachers – Number of Students 6

7. Port Macquarie – Mean Maximum Temperatures
Graphs
Port Macquarie – Mean Maximum Temperatures M
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec Co
25.7
25.9
25.1
23.2
20.6
18.5
17.9
18.8
20.4
21.8
24.7 J F M A S O N D 17 18 19 20 21 22 23 24 25 26
Independent Variable
Months
Dependent Variable
Temperature
Temperature (Co)
Months 7