Planning for a pendulum investigation

AIM:
To investigate how the length of a simple pendulum affects the time period for a complete swing (oscillation).

VARIABLES:
To keep the investigation as simple as possible, only two variables are going to be changed.
Independent Variable:
This is the length of the pendulum; it is independent, as it is not affected by other variables.
Dependant Variable:
This will be the time period (of one oscillation); it is dependant on the length of the pendulum.
Control Variables:
These variables will remain the same throughout the investigation in order to ensure a fair test.
· Mass of bob
· Angle of initial displacement (è)
· Medium through which the bob swings (air)
· Gravitational pull

RANGE:
The ranges of our results depend on the length of the pendulum. The shortest length possible will be ...