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In this activity, learners explore the concept of rotational equilibrium. Learners work in teams to estimate and determine the force within a mobile design. Learners solve algebraic equations, apply graphing techniques, compare results and discuss findings. Designing the mobile requires learners to solve a set of two linear algebraic equations. Learners solve the equations using three different methods: by substitution, by graphing the equations and finding the intersection, and by using determinants.
- 10 to 30 minutes
- 1 to 2 hours
- $5 - $10 per group of students
- Ages 14 - 18
- Activity, Lesson/Lesson Plan
- English
Quick Guide
Materials List (per group of students)
- Student Resource Sheets
- Student Worksheets
- 1/4 x 1/4 by 36-inch balsa wood stick
- Pennies or similar object of uniform weight
- Sewing thread or light string
- Material on which to mount the pennies: e.g. construction paper, cardboard or poster board
- Marking pen
- Cellophane tape or glue
- Scissors
- Ruler marked in millimeters and centimeters or a meter stick
Subjects
-
Engineering and Technology
- Engineering
-
Mathematics
-
Algebra
- Equations and Inequalities
- Variables and Expressions
-
Data Analysis and Probability
- Data Analysis
- Data Collection
- Data Representation
- Geometry
-
Number and Operations
- Fractions
- Operations
-
Algebra
-
The Nature of Technology
-
The Design Process
- Problem Solving
-
The Design Process
-
Physical Sciences
-
Motion and Forces
- Gravity
- Momentum and Velocity
- Rotation Motion
-
Motion and Forces
Informal Categories
- Arts and Crafts
- Toys
Audience
To use this activity, learners need to:
- see
- read
- touch
Learning styles supported:
- Involves teamwork and communication skills
- Links STEM to other topics of interest such as arts and humanities
- Involves hands-on or lab activities
Other
Components that are part of this resource:
Includes alignment to state and/or national standards:
This resource is part of:
Access Rights:
- Free access
By:
Rights:
- All rights reserved, IEEE,