A Flat Bridge
The Paper Folder: lays the first 1/2 sheet of paper between the egg cartons. (Review the Construction Challenge Data Sheet at the end of this handout to see what this bridge looks like.)
Questioner: asks "Are the egg cartons 5 inches apart? Will this be a strong bridge? How many pennies do we think it can support?"
First Penny Placer: test the bridge by placing pennies, one at a time, on the middle of the bridge.
Recorder: on the data sheet, records the number of pennies the flat bridge held.
3. Continue your investigation using the data sheet and bridge descriptions as guides. Remember, your group may come up with their own ideas for investigating the strength of bridges.
A Two-Layer Flat Bridge: Cut the same 1/2 sheet of paper the long way down the middle to make two equal strips. Lay one on top of the other.
A One-Fold Bridge: Use a new 1/2 sheet of paper and fold it in half the long way. Lay it across the egg cartons to form a one-fold bridge.
A Walled Bridge: Use a fresh 1/2 sheet of paper to make a walled bridge. Fold each long side of the paper so that the bridge has walls on both sides.
An Accordian Bridge: Unfold the one-fold bridge. Use the same paper to make the accordion bridge by folding the long side of the paper back and forth. Lay it across the egg cartons to form the accordion bridge.
A More-Folds Accordian Bridge: Experiment with the number and size of the folds in the accordion bridge.
An Arched Bridge: Use two strips of paper (1/2 sheet of paper cut the long way). Create and arched bridge by placing one strip of paper between the egg cartons. You may need to cut the strip so that the arch is the same height as the cartons.) Place the second strip of paper across the arch and egg cartons.