Materials, properties and scales of production
Material questions are never about naming a material. They are about justifying one against the demands of a specific product.
Lesson overview
What you'll learn in this lesson
Select materials and processes with justification for a given design context.
Key learning points
- • Physical and working properties
- • Material families
- • Scales of production
- • Sustainability
This lesson at a glance
- 30 minutes
- 16 parts to scroll through
- 4 quick checks
- Marked quiz at the end
- Gentle pace: short sittings with pauses
Words to know
Scroll down — the lesson carries on below
Watch & discover
Part 1 of 16
Watch first
Materials, properties and scales of production
An English teaching video on this topic from KS3-5 Design & Technology. Watch it, then scroll down for the lesson.
In a nutshell
Select materials and processes with justification for a given design context.
Learning cycle
Part 2 of 16
Learning cycle 1 of 2
Part 1 · Physical and working properties
A short piece of teaching, then a check to make sure it has landed.
Explore the idea
Part 3 of 16
Learn
Physical and working properties
Physical properties include density, conductivity and absorbency. Working properties include strength, hardness, toughness, malleability, ductility, elasticity and durability. Toughness resists sudden impact; hardness resists scratching — a distinction examiners test repeatedly.
Explore the idea
Part 4 of 16
Learn
Material families
Papers and boards, natural and manufactured timbers, ferrous and non-ferrous metals and alloys, thermoforming and thermosetting polymers, and natural and synthetic textiles. Thermoforming polymers can be reheated and reshaped; thermosetting polymers cannot, because they cross-link permanently on curing.
Quick check
Part 5 of 16
Quick check
Which property resists sudden impact?
Quick check
Part 6 of 16
Quick check
Which polymer type can be reheated and reshaped?
Reset break
Part 7 of 16
Pause
That's sitting 1 of 2 done
Stretch, get a drink, look out of the window. There is no timer and nothing is counting down — your place is saved, so you can come back in five minutes or tomorrow.
Learning cycle
Part 8 of 16
Learning cycle 2 of 2
Part 2 · Scales of production
A short piece of teaching, then a check to make sure it has landed.
Explore the idea
Part 9 of 16
Learn
Scales of production
One-off, batch, mass and continuous production. Scale drives process choice: vacuum forming suits low volumes because moulds are cheap, while injection moulding suits high volumes because the expensive mould cost is spread across thousands of units.
Explore the idea
Part 10 of 16
Learn
Sustainability
Use the six Rs — refuse, reduce, reuse, repair, recycle, rethink — plus life-cycle assessment covering raw material extraction, manufacture, distribution, use and disposal. A strong answer names the stage of the life cycle affected by the choice.
Quick check
Part 11 of 16
Quick check
Why does injection moulding suit mass production?
Quick check
Part 12 of 16
Quick check
What does a life-cycle assessment consider?
Explore the idea
Part 13 of 16
Worked example
Model answer: 'Justify the choice of injection moulding for a mass-produced casing' (6 marks)
Injection moulding is appropriate because the product is required in high volume, and although the steel mould is expensive to make, that cost is divided across hundreds of thousands of units, giving a very low cost per item. The process produces complex shapes with consistent wall thickness and an excellent surface finish straight from the mould, so no secondary finishing is needed, which reduces both cost and production time. It also suits thermoforming polymers such as polypropylene, which can be reground and reused, reducing waste. It would be the wrong choice for a one-off prototype, where vacuum forming or 3D printing avoids the tooling cost entirely.
Challenge round
Part 14 of 16
Game · Sort it
Which of these are true?
Drag each card into the right column. Tap a card first if dragging is fiddly.
True
Not true
Mastery quiz
Part 15 of 16
Marked quiz
End of lesson quiz: Materials, properties and scales of production
4 questions, marked with the reasoning shown. No timer.
1. Which property resists sudden impact?
2. Which polymer type can be reheated and reshaped?
3. Why does injection moulding suit mass production?
4. What does a life-cycle assessment consider?
Lesson round-up
Part 16 of 16
Lesson round-up
Ready when you are
Quiz score
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Points this lesson
0
Best run
0 in a row
Luna: 0 out of 4 on the practice checks. Only if you feel up to it — one more?
Ask LunaDo the work
Your written work for this lesson
This is the part you'd do in your book at school. Pick the pieces below, write here or on paper, and photograph anything you draw or work out.
Why the first prototype broke
A team designed a phone stand from 3 mm plywood. The brief said it must hold a 200 g phone at 60° and survive being knocked. The first prototype looked right but snapped at the joint after two knocks.
The team tested again and found the grain of the plywood ran across the narrowest part of the joint, so the wood split along it. They widened the joint from 8 mm to 20 mm, turned the piece so the grain ran along the load, and added a small fillet at the corner to spread the force.
The second prototype survived twenty knocks. It used 15% more material and took four minutes longer to cut — a trade-off the team recorded in their evaluation.
Written for Good Learning Co.
Reading questions
- Name the fault in the first prototype and explain why it happened.
- List the three changes the team made and what each one does.
- Write an evaluation of the second prototype against the brief, including the trade-off.
Design sheet
DiagramSketch two ideas with measurements and notes, then photograph the sheet.
2 labelled sketches
Evaluation
WritingWrite how well your idea meets the brief and what you would change next time.
6–8 sentences
Saved as you type.
Part 1 of 16 · Watch & discover