via Instagram http://ift.tt/1Jxf5BY #180blog I love this demo and the tiny class size means we can treat it like a mini lab. Q1: pick the track that will win a race to the bottom. Q2: pick the track that wins on distance traveled in the air. Prove using conservation of energy why all marbles exit the track at the same speed.
Fun fact: this post was created automatically using a recipe I programmed on IFTTT. It grabs all my Instagrams hashtagged with #180blog and auto-publishes them.