Momentum 2.0 – The Egg Crash
Posted February 6, 2011on:
First, let me be completely up front. I borrowed this activity from my pal Deborah Carder. You can find her link in my blogroll, she does great hands-on activities and labs. I met her at NSTA Philly last year, she is the Energizer Bunny of science teachers, I don’t know how she does it.
Anyway, as I had mentioned in earlier posts on momentum, I wanted to do the egg drop competition, but I’m in a one-story building. This year we are doing the “Egg Crash” competition. The basic concept is that teams get 10 sheets of computer paper, 1 meter of masking tape, a pair of scissors, and 20 minutes to construct a free-standing object to safely catch the egg. They drop their own egg from a height starting at 0.5 meters above the top of their structure. The egg is inspected before and after each drop, the higher they go, the more points they win. The surviving eggs are dropped from 0.5 meters higher each round until they all finally break.
I usually allot 25 points for a lab, I will probably go 50 for this one. Deb said she does 100 points, but that’s a test grade and I don’t think a one-day lab should be worth that much. I’m still working out the scoring, but I think I will assign a grade to each height. If they fail at 0.5 m above their structure, they get 30/50, but they also get a single start-over with a new egg. Each 0.5 m interval earns 5 more points. That means surviving 2.0 m earns 50/50. I’m willing to give 5 or 10 extra credit points if they can survive a drop from 2.5 or 3.o meters over the top. I was going to do direct competition for the points, but what if everyone fails at 1.0 meters? With my grading system, they all get 70% since nobody really earned the A or B.
I handed out the Egg Crash Description and Rules on the day we started learning about Momentum. I told them it will be about a week before we do the competition; I wanted them thinking about the problem and their design as we learn about momentum and impulse. This week I will show a great video called “Car Crash Tech.” The video discusses the state of the art auto safety systems and the effects of air bags and other innovations.
I’m hoping for some creative solutions from the kids. Maybe I’ll have a picture or two to post here in a couple of weeks.