Learning Targets
- Set up a fair material comparison using consistent procedures.
- Record observations, measurements, and test conditions clearly.
- Use test results to support a material recommendation.
IED Unit 4 • Lesson 4.3
Material Testing Lab
Focus question: How can engineers test materials before choosing them for a prototype?
Mission Briefing
Today’s Plan
Use this page with the lesson presentation, your engineering notebook, and the tools or evidence assigned for Run a Controlled Material Test.
Success Looks Like
You can run a simple material test, record observations, and connect results to a design decision.
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Opening Prompt
How can engineers test materials before choosing them for a prototype?
Connect your response to the decision, evidence, or quality standard required for Run a Controlled Material Test.
Reveal: useful engineering move
This lesson is ready to move forward when the evidence meets this standard: The procedure is applied consistently enough that the samples can be compared fairly.
Core Skill
What We Are Practicing
Testing turns a material preference into evidence.
Fair tests control variables so results can be compared.
Test notes should include setup, measurements, observations, and conclusions.
Your Task
Run a Controlled Material Test
Collect comparable evidence from material samples using the assigned test method.
- Identify the independent, dependent, and controlled variables.
- Measure and record each sample consistently.
- Repeat trials when required and note unusual results.
- Photograph or describe the observed failure or deformation.
Quality check: The procedure is applied consistently enough that the samples can be compared fairly.
Lesson Interactive
Interpret a Load–Deflection Test
Use measured load and deflection to calculate stiffness and compare material samples.
Sample Test
Calculated stiffness
| Sample | Load | Deflection |
|---|---|---|
| A | 50 N | 3.5 mm |
| B | 50 N | 2.0 mm |
| C | 50 N | 5.0 mm |
Relationship: stiffness = load ÷ deflection.
Calculate the stiffness value, then identify the sample that deflects the least under the same load.
What You Will Submit
Material Test Data
Submission standard: The procedure is applied consistently enough that the samples can be compared fairly.
Resources
Lesson Resources
Lesson 4.3 PowerPoint
Use the lesson slides for guided practice, interactive checks, and the exit ticket.
Introduction to Engineering Design
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