Compare the fall of 4 nested filters with a single filter. Once again drop the single from 1 meter above the floor. Find the height from which the quadruple nest hits the floor at the same time as the single. Gather data on height for simultaneous arrival versus the number of filters. Plot the data as a graph of height of drop for multiple stack versus number of filters in the stack.
Terminal velocity occurs when the net force on a falling object goes to zero.
No net force means no acceleration. There are two forces on the object gravity and air resistance. The gravity force is proportional to the mass. The air resistance is proportional to the cross sectional area of the filter. Air resistance also increases as the speed increases, for coffee filters the air resistance force is proportional to the square of the speed of fall.