Curricular Unit: Forces All Around

Contributed by: K-12 Outreach Office, Worcester Polytechnic Institute

Quick Look

Grade Level: 7 (6-8)

Choose From: 3 lessons and 3 activities

Subject Areas: Physical Science

A photograph shows a girl riding across the Golden Gate Bridge with the cables and a bridge tower seen behind her.
Whether designing bicycles or bridges, engineers consider the impact of forces at play in our world.
Copyright © 2013 Charles M. Carlson. Used with permission.


Through a series of three lessons, each with its own hands-on activity, students are introduced to 1) forces, loads and stress, 2) tensile loads and failure, and 3) torsion on structures—fundamental physics concepts that are critical to understanding the built world. The associated activities engage students through experimenting with hot glue gun sticks to experience tension, compression and torsion; the design of plastic chair webbing strips; and problem-solving to reinforce foam insulation "antenna towers" to withstand specified bending and twisting.

Engineering Connection

Flexing, deforming, twisting—what happens to materials when forces are applied? Consideration of compression, tension, shear, bending and torsion figures into the design of all the physical objects and structures that engineers create—everything from skyscrapers and bicycles to keyboards, bridge cables, medical implants and snow shovels. To make the designs function as intended, and perform reliably and safely, engineers must apply a thorough understanding of forces and their effects. Engineers are involved in choosing suitable materials and designing new materials such as composites with specific characteristics capable of responding to forces in a desired way.

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 (

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.

  • Students will develop abilities to apply the design process. (Grades K - 12) More Details

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  • Students will develop abilities to assess the impact of products and systems. (Grades K - 12) More Details

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More Curriculum Like This

Fairly Fundamental Facts about Forces and Structures

Students are introduced to the five fundamental loads: compression, tension, shear, bending and torsion. They learn about the different kinds of stress each force exerts on objects.

Strong as the Weakest Link

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...

Middle School Lesson
Investigating Torque

Students learn about torsion as a force acting upon structures and have the opportunity to design something to withstand this force.

Middle School Lesson
Feel the Stress

Working individually or in groups, students explore the concept of stress (compression) through physical experience and math. They discover why it hurts more to poke themselves with mechanical pencil lead than with an eraser.

High School Activity

Unit Schedule

Suggested order to conduct the lessons and hands-on activities:


See individual lessons and activities.


© 2016 by Regents of the University of Colorado; original © 2005 Worcester Polytechnic Institute

Supporting Program

K-12 Outreach Office, Worcester Polytechnic Institute


This unit includes curricula created and tested at the K-12 Outreach Office, Worcester Polytechnic Institute, and the Center for Engineering Educational Outreach, Tufts University.

Last modified: May 23, 2019


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