Expert: Steve Nelson - 11/4/2009

Question
This year, my Junior Physics teacher wants our class to compete at the Physics Fair in the Egg drop. So, my question is, how can I make a suitable device using renewable and biodegradable resources (Paper, cardboard; no plastic, etc) measuring 3x3x3? I have already tried a simple cardboard box, using masking tape and cotton balls as padding. It worked fine from about 10 feet, but after that the egg cracked. I'd like advice on materials to use and possible designs, please!

Thanks,



Emily

Answer
Well, you could use rubber.  It's biodegradeable.  You could make a sling of rubber bands and put them in a solid wooden frame to give the egg maximum deceleration capability.  You also want to consider crush zones out of things like paper, and something to stabilize it so that the carton doesn't turn over.  Trial and error will help more than anything.  Make sure that the weak crush zones are first and the stronger ones to back it up at the end, that way as it's moving faster when the crush zones first start crushing the force won't be maximized but will be evened out during the stopping process.