Year 9 Science · Unit 2 · Lesson 1
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Learning Goals
Real-world context
In 2024, Australia exported over $110 billion of iron ore from the Pilbara region of Western Australia, making it the world's largest iron ore exporter. Iron ore is processed in blast furnaces to produce pig iron, which is then refined into steel, a composite of iron and carbon used in construction, vehicles, and infrastructure across the world. Despite its central role in modern industry, iron ore is a finite resource: once the ore bodies are extracted, they cannot be naturally replenished on a human timescale.
(a) Using lesson vocabulary, classify iron ore and steel as material types. Justify each classification with reference to the material's composition or properties.
(b) Explain why the finite nature of iron ore is a materials science problem, not just an economics problem. In your answer, refer to material properties and the consequences for engineering.
Order the steps
Number the steps from 1 to 6 to show the correct order of the materials design process. Step 1 = what happens first.
| Order | Step |
|---|---|
| Test the selected material in the real application or under simulated conditions. | |
| Survey available materials and compare their property profiles. | |
| Determine the specific properties the material must have (e.g. hardness, conductivity, density). | |
| Select the material whose properties best match the requirements, considering cost and availability. | |
| Identify the need or application, what must the material do? | |
| Refine the design or substitute a different material if testing reveals the selection is unsuitable. |
1. A frying pan base is made from copper and the handle from Bakelite (a polymer). Using the concept of material properties and trade-offs, explain why two different materials are used in the same product.
2. Engineers designing a lightweight racing bicycle can choose between steel, aluminium alloy, and carbon fibre for the frame. Identify which material they would most likely choose and justify your answer using at least two material properties.
Wrap Up
In one sentence, what was the main idea of this lesson?