Day 15: A Standard Unit for Energy
After yesterday's experiments, I decided we should have decided upon a standard unit for energy. In this case, a standard rubberband pulled back some distance stores 1 unit of energy. Need to test how much energy a cart has? Send it into a rubber and see how far it stretches.
I know this isn't perfect, but we aren't developing quantitative relationships now. Just trying to get at the factors which affect the amount of energy in moving carts and stretched rubberbands.
(A puck launcher is pictured here because I forgot to take a picture of my actual set up: two large colored rubberbands from Staples are looped together and stretched across the width of the lab table, secured with c-clamps. A puck launcher would make a nice portable energy measurer. )