Day 118: Building a ModelPosted: March 19, 2013
I took a lot of pictures today.
We are on day 2 of trying to find a model to describe car crashes. The picture above depicts formulas students developed to represent the relationship between initial and final velocities for two cars that crash together. At this point we have limited the situation based on the conditions below (we brainstormed this list after discussing the formulas above);
The arrow is the limitation we want to tackle next. I showed them a car crash where the cars bounce off each other, via magnets, and said go. Off they went. Below are lots of pictures of stuff they worked on as they tried to figure out the situation. Lots of spinning wheels today, which is good. Tomorrow they get a hint.
The picture above is a student explaining to her class how she reasoned out the equation first based on the ratios of the masses and how it should work out. That group’s data then supported her theoretically derived equation.