Our project is named Einstein Machine. There are 3 steps and energy transformation as shown down:

step A: The car falls down the slope and hits the domino to let the dominos fall down.(potential energy–> kinetic energy  kinetic energy–>thermal energy)

Step B: The last domino falls down and hits the balloon. The balloon bounces off causes the tracts above have a slope. The slope causes the ball on it falls down through the railway.(potential energy–>kinetic energy potential–> thermal energy)

Step C: The ball falls down and hits the dominos to make them fall down.The last one with beats on it falls down and hit a bell. The bell rings.( kinetic energy–>sound potential energy–>kinetic energy)