After the whiteboarding of the ‘wiggler’ experiment, today we used our graph and/or EOL to predict an unknown mass. Up to this point I have been calling it a physics wiggler. Today I told the students it is really known as an Inertia Balance. The focus was on the ‘balance’ ad we know balances are used to measure mass. This was the hook into the challenge..use the inertia balance to measure an unknown mass. As an added incentive, if the predicted mass of the unknown was within 5% of the actual, they could eat the unknown… a king size candy bar! (Cue Bow Wow Wow)
As I expected, not many groups earned the candy. It provided a really nice chance to talk about being careful when gathering data.