For a physics project, I need to make a 4meter long track for a marble to travelThe objective is to have the marble reach the end without breaking a single sheet of toilet paper (single ply) or showing any signs of tearIt needs to start on a hill (obviously), do a loop, and go over a bump and must last at least 4meters long.Now the problem I have here is the material to use, I tried some pvc piping, but its not flexible enough, and the next thing I have in mind is cutting a garden hose in half, but I fear that a garden hose would be too narrow and provide too much friction, so what is a good, sturdy, flexible material that would fit say a $20 budget?
