There are three main variables: independent variable, dependent
variable and controlled variables.
Example: a car going down different surfaces.
Independent variable: the surface of the slope rug, bubble
wrap and wood.
Dependent variable: the time it takes for the car to go down
the slope.
Controlled variable: the height of the slope, the car, the unit
of time e.g. minutes and the length of the slope.
Independent
variable
Dependent
variable
Controlled
variables
What you can
decide to
change in an
experiment.
What you
observe or
measure
Things you
keep the
same –do
not
change.
