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There is no such thing as a "density independent variable".
The independent variable is the thing you are changing/varying. The dependent variable is the thing you are measuring. This variable should be affected by the independent variable. Control variables are anything that must be kept constant. If there are any other factors which affect the dependent variable, then these need to be controlled so that they do not have any significant effect (basically ensuring that you are actually measuring the effects of the independent variable).
An independent variable doesn't depend on anything else in the equation. YOU get to decide what it is, and it can be whatever you want. That's why it's called "independent" ... the only thing it depends on is YOUR whim.
The independent variable is the simple machine used and the thing your sliding it on.
The independent variable is the thing you change, the dependent variable is the variable that changes because of the independent variable, it could also be referred to as the effect, and the control group is the constant, the thing that stays the same and the variable that you compare your results to.