Structures vs Rubber Bands

Cards vs Rubber Bands
Can you build a structure that will be able to withstand a rubber band attack?

Building a Bridge

Here's the problem:
We need you to develop a prototype for the platform bridge. Use what you know about structure to build a platform bridge that can hold weight. The platform must have a height of at least 6 inches and be at least 8 inches wide. You will be awarded points as follows:
-1 point for each penny that the platform bridge holds
-1 point for every inch over 6 inches height

Your Materials:
-50 3x5 index cards
-12 inches of painter's tape
-Scissors
-Pennies
-Ruler

Water Tower Challenge

Engineers!
Problem: The principal needs your help, design a water tower model that would allow the school to store their own water.
Criteria and Constraints:
-Built a stable water tower to support a full, unopened water bottle
-Low cost- only supplies provided: 3 sheets of paper
-Minimum height of 8 inches from table top

Strong Structures

Engineers!
You have been challenged to create a cylindrical tower that can withhold 27 or more books.
Can you do it?
Remember: Predict, Investigate, Experiment, Results!!
Update: The record was 56! Good job team!