my independent variable is the length of the wings and my dependent variable is the speed (or time) of which it falls I will make sure that it is dropped from the same height every time by using the same 1 meter ruler every time to make sure it is a accurate test. The variables which will be controlled are the mass, weight, shape, height and paper type.

I will control the controlled variables because if I do not it will not be a precise test. I will do this by isolating them and eliminate them one by one, and not changing the. if they cannot be changed it is called confounding variables.