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The Slingshot Project

A Freshman Engineering Design Project
Developed by Dr. Ron Roedel, Arizona State University

                                               Click here for the PDF version of the lesson
Overview:

Student teams work together to design and build a slingshot device that will launch a squash ball through a given horizontal and vertical location in space.  The students are provided with a plastic water balloon slingshot that has a basket that is the perfect size for holding a squash ball.  Each team is to design a device made of lumber that will hold the plastic slingshot and that can be mounted on a given cart to conduct the specified launch.  The slingshot device must be able to reproducibly launch the squash ball. 

Learning Objectives or Student Outcomes:

By the end of this lesson or activity, students will be able to

1.       design and build a slingshot device that will reproducibly launch a squash ball through a given horizontal and vertical location in space.

2.   maintain a “design notebook” that documents the design process used by the team.

Length of Lesson:

This is generally one of two or three projects in a semester.  The length of the lesson will vary depending on the amount of time devoted to the project in class AND the amount of time given to students for reaching certain checkpoints in the project.

Team Size/Composition:

Teams of 4 work best; if necessary, a few teams of 3 or 5 students may be formed.

How is positive interdependence ensured?

Positive interdependence is ensured through the completion of one final product and one design notebook.

How is individual accountability built in to the project?

Individual accountability is ensured through peer assessments, such as evaluation forms or a salary allocation activity, where each team member divides a given “salary” amongst the different team members and provides a brief explanation of each decision.

Basis or Components of Assessment:

Students will be informed of project design and design notebook deliverables prior to beginning work on the project.  Team progress may be assessed at different points throughout the project; two such checkpoints are 1) when the teams must turn in their design ideas to the wood shop and 2) at the data-gathering point in the project, when students test designs in order to obtain data on the trajectory of the ball being launched.

Team Skills Needed for Success:

Students must have the ability to communicate and collaborate as each team must complete one design and design notebook together.  Each teammate must feel free to contribute ideas and constructive feedback. 

Materials Needed by Students:

  • plastic water balloon slingshot (provided)

  • standard dimensional lumber (provided)

  • standard measuring ruler

  • any team-selected additional parts at a cost not to exceed $5.35 (receipts must be provided)

Content Lesson Links:

Instruction to Students

                                                             Lesson   |   Instruction to Students

©2002, Ron Roedel                                                                                                  
These materials may be duplicated for educational purposes if properly credited.

 

 

 

 

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