A simulation of many marbles rolling down a simple trough (half-pipe/tube). The pipe is aligned from top to bottom. The brightness of the blue indicates the slope in the pipe, the edges have high slope and the trough in the bottom has low slope (flat). Gravity is set 9.8m/s.

• Start position means where the marbles start dropping at the top of the pipe. Half way will be the middle of the pipe.
• The drop accuracy indicates how close the marbles are dropped beside each other.
• Friction indicates how much the force of gravity is dampened by the surface of the pipe. Low friction will be a very smooth tube, like aluminum or PVC, where as high friction will be something potentially sticky or rough.
• Steepness indicates the rise of the pipe from low to high. High is 90 degrees and low is 0 degrees
• Number of marbles is how many marbles are dropped down the pipe and distributed based on drop accuracy.
• Range is the width of the spread of the marbles at the end of the tube. It is presented the difference of maximum exit point to minimum exit point.