Use stored potential energy to catapult a wooden ball into the air with this exciting robot-themed domino set! A tipper car, crazy ball track, tipper arm and series of ramps form an exciting robot production line that you can build again and again. The catapult in this clever domino set launches a wooden ball through the air, adding drama and spectacle! Double-sided track. Spinning arm: Momentum travels through the spinning arm and gravity-release arm and into the third ball. Tipper car: Put a wooden ball in the rail car and release it down the ramp. As the car tips over, the ball is released and starts the 'domino effect'. A finishing flag pops up for a dramatic ending as your last domino falls. The concepts of potential energy, momentum and gravity. Great for developing logical thinking and an understanding of the principles of physics.Details:Multicolor18.31" x 18.31" x 1.37" package size122 piecesWoodFor ages 4 and up