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Paper Ball Run Challenge for Grades 6-8


Grade Range
Group Size
1-4 students
Active Time
2-3 hours
Total Time
2-3 hours
Area of Science
Civil Engineering
Engineering Challenge
Key Concepts
Time, distance, speed, forces, engineering design
Ben Finio, PhD, Science Buddies

This engineering challenge is based on an internal competition designed by employees at Fluor Corporation.


Add a twist to a classic activity with this fun lesson plan. Your students will design and build a ball run for a ping pong ball using nothing but paper and tape. Their goal is to make the slowest ball run possible. How long can they make it take for the ball to go through their ball run? The 2022 competition is over, but you can see what students built and learn about the winners on the 2022 Engineering Challenge summary page. Teachers, note that elementary and high school versions of this lesson plan are also available.

Remote learning adaptation: Students can watch the introductory video and follow the instructions on the Student Worksheet to build and test their ball runs independently at home. If you would like students to work collaboratively, they can share their ideas with each other via video conferencing or shared online documents/photos.

Learning Objectives

NGSS Alignment

This lesson helps students prepare for these Next Generation Science Standards Performance Expectations:
This lesson focuses on these aspects of NGSS Three Dimensional Learning:

Science & Engineering Practices
Engaging in Argument from Evidence. Evaluate competing design solutions based on jointly developed and agreed-upon design criteria.
Disciplinary Core Ideas
ETS1.B: Developing Possible Solutions. There are systematic processes for evaluating solutions with respect to how well they meet the criteria and constraints of a problem.
Crosscutting Concepts
Structure and Function. Structures can be designed to serve particular functions by taking into account properties of different materials, and how materials can be shaped and used.


different types of paper, tape, and a ping pong ball for materials

If you want to enter your students' designs in the 2022 Engineering Challenge, you can only use the materials listed below.

Background Information for Teachers

This section contains a quick review for teachers of the science and concepts covered in this lesson.

You might know them by different names: ball run, marble run, ball machine, or rolling ball sculpture. Whatever you call them, these devices start out with at least one ball at the top, and the ball works its way to the bottom as it rolls, bounces, and travels through various features and obstacles (Figure 1).

A large kinetic ball sculpture A large kinetic ball sculpture
Figure 1. Left: a small toy marble run, (Wikimedia Commons user Carl Steinbeißer). Right: a large rolling ball sculpture, Wikimedia Commons user Beyond My Ken. (CC BY-SA 4.0).

The 2022 Engineering Challenge is inspired by ball runs like those in Figure 1. As shown in the video, the goal is to build a ball run using only paper and tape, but there's a twist. Your students want to make the ball take as long as possible to make it through the ball run. Figure 2 shows some examples of the types of ball runs your students might build in this project.

A switchback ball run built from paper and tape A 'plinko' style ball run built from paper and tape
A switchback ball run with several obstacles built from paper and tape A ball run with a large funnel built from paper and tape
Figure 2. Several different paper ball run designs.

You can use this project to explore several topics in physics and engineering with your students. Rather than explain each topic in detail, this Background section will give you a brief overview. The links in the Additional Background section provide some more information.

  • Kinematics is the study of motion. How are quantities like distance, time, and velocity related? What do they have to do with the ball's path and how long it takes to travel through the ball run?
  • The ball run uses different forms of energy. The ball has gravitational potential energy when it is placed at the top of the machine. Some of this energy is converted to kinetic energy (the energy of motion) as the ball gains speed. Some of this energy is lost to friction and converted to thermal energy (heat) as the ball moves. When the ball collides or bounces off something, some of the kinetic energy is converted to other forms, like acoustic energy (sound).
  • The ball run might make use of different simple machines, like levers, inclined planes (ramps), or even a wheel and axle. How can your students incorporate different simple machines into the design of their ball runs? How can they slow the ball down?
  • If a student makes a ball run taller, it can take longer for the ball to travel through it. However, building a taller ball run can be difficult. It needs to be sturdy so it does not fall over. For example, students might need to connect beams in triangular shapes to form trusses to support a tall ball run.
  • You can use this project to practice the engineering design process with your students. They will need to design, build, and test their ball runs, and then change them or make improvements, and test again. This process is called iteration.

Prep Work (15 minutes)

Engage (5 minutes)

Explore (1-2 hours)

Reflect (20 minutes)


Make Career Connections

Lesson Plan Variations

Free science fair projects.