The last segment of the nine-part unit makes a connection between springs and linear equations. Groups hang weights from the spring and measure its length. Then, using the data collected, they calculate the slope to find the k-value of the spring.

Concepts

hooke's law, constant of proportionality, slope, spring, elasticity, proportional reasoning, technology resources

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Instructional Ideas

• Use different sizes of springs to calculate multiple k values

Classroom Considerations

• The activity requires several pieces of equipment to measure the stretch on the springs
• Individuals should be able to find the slope of a line given two points

Pros

• Provides a sample data collection table for the groups to use
• Includes a post-activity assessment to connect the activity to engineering practices

Cons

• None

Common Core

8.SP.A.1 8.SP.A.2 8.SP.A.3 HSA-SSE.A.1.a HSA-CED.A.4 HSF-IF.B.6 HSS-ID.C.7