Egg-speriment. (Hands-On Science).
4 raw eggs * modeling clay * phone books or other heavy books * a board large enough to hold the books (such as a large, thin chopping block)
* aluminum roasting pan
1. Shape the modeling clay into "cushions" for the eggs. Divide the clay into eight round balls. Then flatten the balls into small disks. Use your thumb to make an indentation in the center of each disk.
2. Place one cushion on the top and one cushion on the bottom of each egg.
3. Place the eggs in the pan, pointed side up. Space them so that each egg will support one corner of the board. Gently place the board on top of the eggs.
4. For the next part of the experiment you'll stack books on top of the board. But before you begin, predict how many books and how many kilograms (or pounds) the eggs will hold. If this is a group experiment, survey your classmates.
5. Place books on the board, one at a time. Center them in the middle of the board. Continue adding phone books until at least one of the eggs breaks.
How many books did the eggs support? Also, weigh the books. Is this more or less than you expected? Why are the eggs so strong?
DON'T STOP NOW!
Look at the buildings, bridges, and other structures around you. Where do you see arches? What do they support? Explore the strength of other shapes. Is there another shape that's particularly strong?
|Printer friendly Cite/link Email Feedback|
|Date:||Sep 13, 2002|
|Previous Article:||It may not be the Oscar ... but then again, in our world it is!|
|Next Article:||Rate your air. (Chart-Reading Skills).|