For our Rube Goldberg machine we decided we wanted the end result for a bell to be rung. Our Rube Goldberg machine started by having a car drive into a ball that then went bounced off a wall into a spiral. As the ball exits the spiral the ball will knock over some dominos. Those dominos will then tip over and hit a ball into a vertical plane. The ball will then knock over more dominos and the final domino will land on the bell and ring it.