Drag is affected by mass.
For the same density drag rises as size squared, while mass rises as size cubed.
Added - if shape is the same.
Mass is a good choice of a dependent variable to link that.
Don't forget Tinstaafl that while Cd does have that dependence, the drag force derived from it has an area term too.
If objects only differ in density, and have the same size and shape, they will definitely not fall at the same rate.
Last edited by awblain; 10th Mar 2014 at 08:37.
Reason: Being clearer on "Drag is affected by mass"