Day 42: Spring Challenge
Today we wrapped up the spring lab (see Day 36). Each group whiteboarded their spring lab graphs and equations. Then, before whiteboard discussion, I collected the springs and gave the class the following challenge:
Each colored spring will have an identical weight attached to it in order to stretch it to a new length. Rank the springs from longest to shortest.
Since we had not done the mass/weight lab yet, it was helpful that all the colored springs were the same length. (If we already had the mass/weight lab under our belts, I would have included the shorter and springer silver spring in the ranking.) Students had to look at the equations/graphs from each of the other groups and make sense of them in light of the challenge. It took a few minutes, and there was some debate within/between groups, but as you can see in the video, they were sucessfull.
Now we are ready to talk about Hooke’s Law and spring constant. The challenge helped prime their brains.