materials and their working properties
4 detailed 50-minute lessons with teaching scripts, worked examples, parent guides, and assessment criteria.
Lesson Overview
Total Lessons: 4
Tier: Foundation and Higher
Duration: 50 minutes per lesson (200 minutes total)
Exam Boards: AQA, Edexcel, OCR, Eduqas, CCEA
Tier: Foundation and Higher
Duration: 50 minutes per lesson (200 minutes total)
Exam Boards: AQA, Edexcel, OCR, Eduqas, CCEA
Learning Objectives
- Explain the key ideas of materials and their working properties
- Apply materials and their working properties to exam-style questions
- Develop independent study skills
- Build cross-topic connections
Prerequisites
- Read the revision notes for materials and their working properties first (GCSE Revise summary)
- Key vocab to pre-teach: D&T Exam Tips
- Basic skills: reading the summary notes and answering the practice questions there
Materials & Equipment
- Exercise book, coloured pens
- Ruler
- Printed revision notes (link below)
- Internet for videos (see Resources)
Lesson 1: Introduction: materials and their working properties
Duration: 50 minutes
Starter Activity (5 minutes)
Quick Recall
Write down everything you already know about materials and their working properties. Then check against the key terms: D&T Exam Tips. Use a mini-whiteboard or paper.
Main Content (35 minutes)
Parent/Teacher Guide:
Before lesson: Read the script below. Pre-teach key vocab: D&T Exam Tips.
If stuck: Re-read the revision notes (link above), then break the content into smaller steps.
Extension: See the Stretch & Challenge ideas in Lesson 4.
Before lesson: Read the script below. Pre-teach key vocab: D&T Exam Tips.
If stuck: Re-read the revision notes (link above), then break the content into smaller steps.
Extension: See the Stretch & Challenge ideas in Lesson 4.
Teaching Script (35 mins):
Mins 0-5 - Hook: "Today: materials and their working properties. By the end you will be able to answer exam questions on it unaided. It connects to the rest of Design and Technology because the ideas here recur across the spec."
Mins 5-20 - Direct Instruction: Work through the core ideas below one at a time; after each, ask your student to explain it back in their own words.
Mins 20-30 - Guided Practice: Model the worked example together, then let your student attempt the first practice question with guidance.
Mins 30-35 - Independent Practice: 2-3 practice questions from Lesson 3 below, with immediate feedback.
Mins 0-5 - Hook: "Today: materials and their working properties. By the end you will be able to answer exam questions on it unaided. It connects to the rest of Design and Technology because the ideas here recur across the spec."
Mins 5-20 - Direct Instruction: Work through the core ideas below one at a time; after each, ask your student to explain it back in their own words.
Mins 20-30 - Guided Practice: Model the worked example together, then let your student attempt the first practice question with guidance.
Mins 30-35 - Independent Practice: 2-3 practice questions from Lesson 3 below, with immediate feedback.
First Look
Start with the revision notes summary, then attempt: Explain the difference between hardness and toughness, giving an example of a material that is hard but not tough.
Plenary (5 minutes)
Check Out
Your student states one thing they learned and one question they still have about materials and their working properties.
Lesson 2: Core Concepts: materials and their working properties
Duration: 50 minutes
Starter Activity (5 minutes)
Review Previous Lesson
Quick recap: write 3 key points from Lesson 1 on materials and their working properties. Check them against the notes below.
Main Content (35 minutes)
Key Fact: Hardness: resistance to scratching and indentation — diamonds, ceramics, hardened steel. Crucial for cutting tools, wear surfaces.
Key Fact: Toughness: ability to absorb energy and deform without breaking — polycarbonate, mild steel, rubber. Essential for safety-critical products like helmets.
Key Fact: Brittleness: tendency to crack or shatter under impact — glass, ceramics, cast iron. Not the same as hardness — glass is hard AND brittle.
Key Fact: Ductility: ability to be drawn into wires — copper, aluminium, gold. Essential for electrical wiring and wire-forming processes.
Key Fact: Malleability: ability to be shaped by hammering/rolling — gold, lead, aluminium. Important for sheet metal forming, pressing, forging.
D&T Exam Tips: When justifying material choices, use the FPP structure: Function (what must the product do), Property (which material property enables this), Proof (specific data or evidence). E.g. 'A frying pan must conduct heat evenly (function); aluminium has high thermal conductivity (property); at 205 W/mK it heats quickly and uniformly (proof).'
| Term | Meaning | Example |
|---|---|---|
| Tensile strength | Resistance to pulling apart | Tensile test machine |
| Compressive strength | Resistance to crushing | Compression test |
| Hardness | Resistance to surface scratching | Vickers/Brinell test |
| Toughness | Energy absorption before fracture | Impact (Izod/Charpy) |
| Ductility | Ability to be drawn into wire | Elongation test |
| Density | Mass per unit volume (kg/m3) | Measure mass/volume |
Practice (10 minutes)
Q: Explain the difference between hardness and toughness, giving an example of a material that is hard but not tough.
Answer: Hardness = resistance to surface deformation/scratching. Toughness = ability to absorb impact energy without fracturing. Glass is hard (resists scratching) but not tough (shatters on impact). In contrast, rubber is not hard (easily scratched) but is tough (absorbs impact energy without breaking).
Plenary (5 minutes)
Explain Back
Your student teaches the key points back to you without looking. Fill any gaps immediately.
Lesson 3: Application: materials and their working properties
Duration: 50 minutes
Starter Activity (5 minutes)
Quick Recall
Recall the key terms: D&T Exam Tips. Define each in one sentence.
Main Content (35 minutes)
Parent/Teacher Guide: Let your student attempt each question alone first, then compare with the model answer. Award method marks for correct working even if the final answer is wrong.
Q1: Explain the difference between hardness and toughness, giving an example of a material that is hard but not tough.
Answer: Hardness = resistance to surface deformation/scratching. Toughness = ability to absorb impact energy without fracturing. Glass is hard (resists scratching) but not tough (shatters on impact). In contrast, rubber is not hard (easily scratched) but is tough (absorbs impact energy without breaking).
Q2: A designer needs a material for electrical wiring. Justify the choice of copper over steel based on working properties.
Answer: Copper: excellent electrical conductivity (second only to silver), ductile (easily drawn into wire), malleable (easy to bend during installation), corrosion resistant (forms protective patina). Steel: poor conductivity, less ductile (harder to draw and bend), heavier, prone to rust. Copper is chosen for its combined conductivity and workability despite being more expensive than steel.
Q3: Why is brittleness an important consideration when selecting materials for a car bumper?
Answer: A car bumper must absorb impact energy without shattering — it needs toughness, not hardness. A brittle material (e.g. rigid plastic or ceramic) would crack on impact, failing to protect the vehicle and creating sharp debris. Modern bumpers use tough polymers (polypropylene, polycarbonate blends) that deform to absorb energy then spring back.
Plenary (5 minutes)
Error Review
Review any questions answered incorrectly. Identify whether the error was knowledge, method, or reading the question.
Lesson 4: Exam Practice: materials and their working properties
Duration: 50 minutes
Starter Activity (5 minutes)
Command Words
Review what these command words require: state (one point), describe (say what happens), explain (say why), compare (both sides), evaluate (judgement).
Main Content (35 minutes)
Extended Answer
Extended question: Full-Mark Response Compare the suitability of mild steel and polycarbonate for a child's bicycle helmet shell, considering at least four working properties. <div class="
A grade 9 response will: identify helmet requirements (impact protection, lightweight, comfort, durability); compare properties — Toughness: polycarbonate is extremely tough (absorbs impact, deforms without shattering); mild steel is tough but dents permanently. Weight/density: polycarbonate approx 1.2 g/cm3; mild steel approx 7.8 g/cm3 — steel helmet would be unbearably heavy. Malleability: polycarbonate can be vacuum-formed into complex shell shapes; steel requires stamping with limited formability. Corrosion: polycarbonate is inert; steel rusts unless coated. Conclusion: polycarbonate is far superior for this application due to its combination of toughness, low density, formability and corrosion resistance.
Exam Tips: Never confuse hardness and toughness — they are different properties and examiners test this specifically | Always link the property to the product's function — 'copper is ductile, which means it can be drawn into thin wires for electrical cables' | Use comparison language: 'whereas', 'in contrast', 'however'
Common Errors: Watch Out! Students often make mistakes here. Wrong: Strong materials are always the best choice because they will not break under any conditions. Correct: 'Strong' is vague — different products need different properties. A bridge needs high tensile strength; a helmet needs toughness; a window needs hardness (scratch resistance) and transparency; a wire needs ductility and conductivity. 'Strong' must be qualified: strong in tension? compression? impact? The best material matches the specific property requirements of the product.
Stretch & Challenge (Grade 8-9):
- Synoptic links: explain how materials and their working properties connects to another Design and Technology topic you have studied
- Real-world: research one real-world use or example of materials and their working properties
- Critical: "What are the limitations of the models used in materials and their working properties?"
Plenary (5 minutes)
Assessment Criteria
- Got it: Confident explanation + correct worked examples
- Getting there: Main points OK, needs support with detail
- Not yet: Confused on key concepts - re-run Lesson 2
Homework & Consolidation
- Consolidation: Re-answer any Lesson 3 practice questions answered incorrectly (20 mins)
- Retrieval: Write flashcards for the key terms: D&T Exam Tips (10 mins)
- Exam practice: One past-paper question on materials and their working properties from the board websites (15 mins)
- Extension: Explain materials and their working properties to someone else in your own words (10 mins)