Grade Level: Middle school
Time Required: 2 hours
Expendable Cost/Group: US $1.00
Group Size: 3
Subject Areas: Science and Technology
Bolded words are vocabulary and concepts to highlight with students during the activity.
Civil engineers design structures such as buildings, dams, highways, bridges, roller coasters, tunnels, skyscrapers, and sports arenas, among many others. It is important that the structures are soundly built so they are safe for people to use. Today, you will get a taste of what it is like to be an engineer by making bridges using dry spaghetti noodles as the primary building material. Then you will test your bridges to see how much weight they can hold before breaking.
Each group needs:
- paper and pencils
- ~1 pound dry spaghetti (do not use thin spaghetti)
- hot glue gun and glue sticks
- 1 sheet of newspaper
For the class to share:
- yardstick or tape measure
- 2-3 sheets of newspaper
- 2 desks or tables at equal heights from the floor
- weights (same-size textbooks work well)
Students design and build bridges using uncooked spaghetti as the primary building material with the objective to maximize the amount of weight the bridge can hold. Then they test the bridges by applying weight until the bridge fails (breaks). Note: This activity can be extended to a 180-minute activity if students choose to make their bridges more intricate.
- Show students the available building materials: spaghetti and hot glue.
- Explain the engineering challenge: To design and build a bridge that spans an 18-inch (46-cm) gap and can hold as much weight as possible (measured by textbooks, placed one at a time).
- Organize students into groups of three. Hand out paper and pencils.
- Explain the design requirements:
- Incorporate into their designs some sort of construction/assembly pattern that makes the bridge sides and bottoms stronger. To help generate ideas, show students the example truss bridge designs in Figure 1. Point out how the designs are made from short straight pieces put together in patterns that often include triangles.
- Make the bridges at least 18-inches long so they can rest on each side of the testing station gap.
- Have groups sketch their bridge ideas, including dimensions.
- While students are designing, set up a testing station in the classroom by placing two desks 18-inches (46-cm) apart. Lay newspaper on the floor between the gap to catch pasta debris. Also cover student work areas with newspaper sheets to catch hot glue drips.
- Have students get instructor approval of their sketches before they begin building.
- Give groups time to create their bridges. Suggest they bring them to the testing station to check the length. Carefully monitor hot glue use for safety.
- With 10-15 minutes left, have each group bring its bridge to the testing station. One by one, place books on the bridge until it collapses. On the classroom board, keep track of group names and failure weights.
- Lead a class discussion to compare the failure weights to the various bridge designs and ask the wrap-up questions.
- Clean up!
Wrap Up - Thought Questions
- What worked well about your design? Why?
- What did not work well? Why not?
- What additional materials might be useful for constructing your bridge? How would you use them?
More Curriculum Like This
Students learn why engineers must understand tissue mechanics in order to design devices that will be implanted or used inside bodies, to study pathologies of tissues and how this alters tissue function, and to design prosthetics. Students learn about collagen, elastin and proteoglycans and their ro...
Students explore the basic characteristics of polymers through the introduction of two polymer categories: thermoplastics and thermosets. During teacher demos, students observe the unique behaviors of thermoplastics.
To introduce the two types of stress that materials undergo — compression and tension — students examine compressive and tensile forces and learn about bridges and skyscrapers. They construct their own building structure using marshmallows and spaghetti to see which structure can hold the most weigh...
Students are presented with a brief history of bridges as they learn about the three main bridge types: beam, arch and suspension. They are introduced to two natural forces — tension and compression — common to all bridges and structures.
Copyright© 2016 by Regents of the University of Colorado
Last modified: July 21, 2017