# Lesson:Leaning Tower of Pasta

### Quick Look

Time Required: 45 minutes

Lesson Dependency: None

Subject Areas: Physical Science, Physics

### Summary

Using spaghetti and marshmallows, students experiment with different structures to determine which ones are able to handle the greatest amount of load. Their experiments help them to further understand the effects that compression and tension forces have with respect to the strength of structures. Spaghetti cannot hold much tension or compression; therefore, it breaks very easily. Marshmallows handle compression well, but do not hold up to tension.
This engineering curriculum aligns to Next Generation Science Standards (NGSS).

### Engineering Connection

Engineers consider tension and compression forces when designing a building or structure, and choosing the materials to build it. All structures must be able to handle the forces that act upon them so they will not fail and injure people, wildlife or the environment. Like all structures, the foundation, frame and joints of a skyscraper must be able to withstand enormous tension and compression forces — from the weight of its own materials, the load of people and equipment it holds and the impact of natural forces such as wind, snow and earthquakes.

### Learning Objectives

After this activity, students should be able to:

• Understand that compression and tension affect the stability of a structure
• Compare their model to others to understand why some models are stronger than others
• Use number sense to correlate the strength of a structure to the amount of weight it holds
• Understand why engineers consider tension and compression forces when designing and choosing the appropriate materials for a building or structure

### Educational Standards Each TeachEngineering lesson or activity is correlated to one or more K-12 science, technology, engineering or math (STEM) educational standards. All 100,000+ K-12 STEM standards covered in TeachEngineering are collected, maintained and packaged by the Achievement Standards Network (ASN), a project of D2L (www.achievementstandards.org). In the ASN, standards are hierarchically structured: first by source; e.g., by state; within source by type; e.g., science or mathematics; within type by subtype, then by grade, etc.

###### NGSS: Next Generation Science Standards - Science
NGSS Performance Expectation

MS-ETS1-2. Evaluate competing design solutions using a systematic process to determine how well they meet the criteria and constraints of the problem. (Grades 6 - 8)

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This lesson focuses on the following Three Dimensional Learning aspects of NGSS:
Science & Engineering Practices Disciplinary Core Ideas Crosscutting Concepts
Evaluate competing design solutions based on jointly developed and agreed-upon design criteria.

Alignment agreement:

There are systematic processes for evaluating solutions with respect to how well they meet the criteria and constraints of a problem.

Alignment agreement:

NGSS Performance Expectation

MS-ETS1-1. Define the criteria and constraints of a design problem with sufficient precision to ensure a successful solution, taking into account relevant scientific principles and potential impacts on people and the natural environment that may limit possible solutions. (Grades 6 - 8)

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This lesson focuses on the following Three Dimensional Learning aspects of NGSS:
Science & Engineering Practices Disciplinary Core Ideas Crosscutting Concepts
Define a design problem that can be solved through the development of an object, tool, process or system and includes multiple criteria and constraints, including scientific knowledge that may limit possible solutions.

Alignment agreement:

The more precisely a design task's criteria and constraints can be defined, the more likely it is that the designed solution will be successful. Specification of constraints includes consideration of scientific principles and other relevant knowledge that is likely to limit possible solutions.

Alignment agreement:

Models can be used to represent systems and their interactions.

Alignment agreement:

###### Common Core State Standards - Math
• Construct and interpret scatter plots for bivariate measurement data to investigate patterns of association between two quantities. Describe patterns such as clustering, outliers, positive or negative association, linear association, and nonlinear association. (Grade 8) More Details

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###### International Technology and Engineering Educators Association - Technology
• Students will develop an understanding of the attributes of design. (Grades K - 12) More Details

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• Structures rest on a foundation. (Grades 6 - 8) More Details

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• Make two-dimensional and three-dimensional representations of the designed solution. (Grades 6 - 8) More Details

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###### State Standards
• Solve real-world and mathematical problems involving the four operations with rational numbers. (Grade 7) More Details

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• Construct and interpret scatter plots for bivariate measurement data to investigate patterns of association between two quantities. (Grade 8) More Details

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• Predict and evaluate the movement of an object by examining the forces applied to it (Grade 8) More Details

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### More Curriculum Like This

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...

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Bridging the Gaps

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.

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### Introduction/Motivation

Have you ever wondered how really tall buildings stay up? Why do sky scrapers not fall down when wind hits them? Engineers work with architects and scientists to understand what makes materials break, and then use what they learn to design strong structures. Today, you will have the opportunity to figure out how to make a strong structure, too. Sometimes, engineers may be able to find very strong materials, but they cannot use them in a structure because the material are too expensive. Sometimes, engineers cannot use as much material as they might like due to budget or supply limitations. Just like an engineer, today you will be constrained; you can only use a limited amount of materials. Your job is to design and build a structure that is as tall and strong as possible, using only marshmallows and spaghetti.

As you build, think about what forces will be acting upon your structure. Which parts will be pushed together — that is, which will experience compression — and which parts will be pulled apart — that is, which will be under tension. Is it better to have a piece of spaghetti or a marshmallow under tension? Under compression? How will you design the tallest, strongest structure using limited resources?

### Assessment

Pre-Activity Assessment

Discussion Question: Solicit, integrate and summarize student responses.

• Have you ever built a tower? What did you use for the material(s)? How strong was it? How did you know it was/was not strong?

Activity Embedded Assessment

Worksheet: Have the students complete the activity worksheet; review their answers to gauge their mastery of the subject.

Pairs Check: After student teams finish their worksheets, have them compare answers with a peer group, giving all students time to finish the worksheet.

Post-Activity Assessment

Class Presentations: Have the student groups take turns presenting the structures to the rest of the class. Ask them to explain where the forces tension and compression are taking place. Have the class determine which shapes seem to be the strongest for holding up weight.

Toss-a-Question: Using questions 1-7 on the Standing Strong Worksheet, have students work in groups and toss a ball (or wad of paper) back and forth. The student with the ball asks a question and then tosses the ball to someone to answer. If a student does not know the answer, s/he tosses the ball onward until someone gets it. The person who gets the answer correct gets to start the next question. Review the answers at the end and have the students write down the correct answers on their worksheets.

### Lesson Extension Activities

Have the students build models using materials other than marshmallows and pasta, such as toothpicks, gumdrops, caramels, Popsicle sticks, etc. Which materials made even better buildings than spaghetti and marshmallows, and why? Have the students discuss these materials in terms of compression and tension.

Give each material a cost and give groups a budget (i.e. spaghetti noodle \$0.10 and marshmallows \$0.20 with a \$10.00 budget). Let groups pick how much of each material they want with the given budget and create a structure.

Have the students design their own experiment to look at the geometry behind different structures. Which shape can hold the most weight — a triangle, square or circle? Challenge the students to explain their answers by creating diagrams showing the compression and tension forces on each shape.

### Contributors

Chris Yakacki; Ben Heavner; Malinda Schaefer Zarske; Denise Carlson

### Supporting Program

Integrated Teaching and Learning Program, College of Engineering, University of Colorado Boulder

### Acknowledgements

The contents of this digital library curriculum were developed under a grant from the Fund for the Improvement of Postsecondary Education (FIPSE), U.S. Department of Education, and National Science Foundation GK-12 grant no 0338326. However, these contents do not necessarily represent the policies of the Department of Education or National Science Foundation, and you should not assume endorsement by the federal government.