In my rube goldberg i have all six simple machines. It starts with dominos then it hits a wheel and it keeps rolling down until it hits another wheel. After that the wheel rolls in a inclined plane and out of the ramp. Then it hits more dominos and it hits a pulley. The pulley drops down on to a screw. After that the screw pops the balloon filled with 3 marbles. The marbles go in a inclined plane. Gets the dominos and it pulls a wedge. After that a wheel rolls into a inclined plane it bounces up and pushes the balloon that has a heavy ball. And it goes back to the top and it pops finally the heavy ball drops. It goes on a lever.