I did this experiment for school. A balloon is filled with water, and then a cork with a drilled hole is plugged into the end. I'm trying to find the relationship between horizonatal displacement and the size of a hole in a cork. Manipulated variable is the size of the hole in the cork. Responding variable is the water's horizontal displacement. It turns out that horizontal displacement is directly related to the diameter of the hole. In other words, the smaller the hole, the less the displacement. Why does this happen? For example if you take a hose and cover a part of it, the water will go further. Thanks a lot everyone!