Building a Lego to push the ball down the ramp.
Moving the ball without my hands.
I used legos and a small tire from car and a ball and cardboard.
A tire is attached with a string and when it unwinds from the pole it pushes a hammer that makes the seesaw lever push the ball.
It shows how one action can trigger another.
I could add more Legos and make more chain reactions.
Mom.