Materials and Product Design
FoundationProducts are made of plastic, wood, glass and metal; matching material properties with clever design makes them practical and beautiful — try designing a rain collector.
- Products are made of materials like plastic, wood, glass and metal.
- Material properties must match product function.
- Good structural design improves function.
文體小知識：工程記敘把設計挑戰的過程記下來：定目標、畫草圖、動手做、測試再改良。這一篇帶你設計雨水收集器。
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1Look around: plastic bottles, wooden chairs, glass windows, metal spoons — every product is made of materials. Designers first think about what a product must do, then choose suitable materials: bottles are light and shatterproof, so they are plastic; windows must let light through, so they are glass; desks must be sturdy and lasting, so they are wood or metal.
2Four common materials each have their properties: plastic is light, waterproof and colourful; wood is sturdy, warm and easy to work; glass is clear and smooth but breaks easily; metal is hard, durable and conducts heat fast. Properties must match function: pots are metal because they conduct heat, while wok-spade handles are wood or plastic because they insulate and do not scald.
3Good design also improves function through structure and detail: an umbrella's ribs spread its canopy and fold neatly; the dip in a bottle helps your hand grip; a pencil case's zip opens smoothly; thick padded straps make a schoolbag comfortable. Small changes, big improvements — that is the power of design.
4Products must be practical and beautiful: practical means easy to use, durable and safe; beautiful means colours, patterns and shapes that delight. Cartoon-printed bottles make classmates drink more; reflective strips make schoolbags safer at night. Only products both practical and beautiful truly win hearts.
5Designers' methods are worth learning: set a goal, sketch a design, choose materials, build it, then test and improve. Try an engineering challenge: with three paper cups and a pair of scissors, design a rainwater collector that gathers more rain than three plain cups. Use your brain — you are a little engineer!
1Summary 重點摘要
Products are made of plastic, wood, glass and metal; matching material properties with clever design makes them practical and beautiful — try designing a rain collector.
2Vocabulary cards Vocabulary
What products are made of, such as plastic, wood, glass and metal.
A light, waterproof material for bottles and toys.
Sturdy material from trees, used for desks and chairs.
Clear, smooth material that breaks easily; used for windows and cups.
Hard, durable material that conducts heat, like iron and aluminium.
The shape and framework of a product, like an umbrella's ribs.
What a product can do, like a bottle holding water.
A design that is easy to use, durable and safe.
Colours, patterns and shapes that delight people.
The process of planning a product's look and function.
3Step by step Steps
- Step 1: Know the properties of common materialsObserve four materials safely at home: a plastic bottle is light and waterproof and usually survives a fall; a wooden ruler is sturdy and warm with a wood grain; a glass cup is clear and smooth but shatters when knocked — handle with care; a metal spoon is hard and conducts heat, turning hot quickly in soup. Touch and compare (safely), and note each material's traits: heavy or light, waterproof or not, breakable or not, heat-conducting or not. Knowing materials is the first step of choosing well.
- Step 2: Match materials to product functionThink why each product uses its material: umbrellas use waterproof cloth and light metal ribs to block rain yet stay light; windows use glass to admit light; woks use metal to conduct heat for cooking; spade handles use wood or plastic to insulate the hand; toys use plastic for lightness and bright colours. Now reverse it: if a bottle were glass, what happens when it drops? If a window were an iron sheet, could you see the view? Wrong material, useless product.
- Step 3: Good design improves functionStudy clever details in products: an umbrella's folding ribs snap open at the touch of a switch; a bottle's neck has grip ridges so it will not slip; a pencil box has compartments keeping pens and rulers in place; wide padded bag straps spread the weight so shoulders do not ache. All are examples of structure and detail lifting function. Practise yourself: pick a product, spot which detail makes it better, and ask which one place you would improve.
- Step 4: Take the rain collector challengeThe engineering challenge: materials are only three paper cups, the only tool a pair of scissors, and the goal is a collector gathering more rain than three plain cups. First find the key: to collect more rain, enlarge the area that catches it, and let the water flow into storage without escaping. Sketch first: which cup becomes the funnel? Which cup stores the water? How do they stack? Plan before cutting — cut wrongly and the material is wasted.
- Step 5: Build and testA way to build it: cut the bottom off the first cup to make a wide-topped, narrow-based funnel with the mouth up; cut the second cup open, flatten and roll it into an even wider trumpet mouth set on top of the funnel for a bigger catchment; the third whole cup sits below as the tank, with the funnel's spout aimed into it. Then test: use a spray bottle at the same height to mimic rain over both the three plain cups and the collector, then measure — did the collector gather more? Record the results.
- Step 6: Review, improve, and balance practicality with beautyReview after testing: did rain splash out of the trumpet mouth? Did the funnel tilt and spill water? Improve by widening the mouth, fixing the parts with tape, or placing the collector in a more open spot. Think practicality and beauty together: paper cups go soft when wet, so empty and dry them quickly after testing; draw patterns on the cup to make the collector attractive. Finally present your design to classmates: what was the goal, how did you build it, how did you improve it? Engineering improves through exactly this cycle.
5Worked example Example
Engineering challenge: materials are three paper cups and the tool is a pair of scissors. Build a rainwater collector that gathers more rain than three unprocessed cups. How would you design it?
- Set the goal and limits: only three cups and scissors; to beat the plain cups, enlarge the rain-catching area.
- Sketch and build: cut the bottom off one cup for a funnel, cut and roll the second into a wide trumpet mouth on top, and keep the third whole below as the tank.
- Test: spray water from the same height to mimic rain over both the three plain cups and the collector, then measure and compare.
- Improve: widen the trumpet if rain splashes out, tape the funnel steady, place the collector in the open, and empty and dry the cups promptly after testing.
- Answer: Cut the cups into a funnel and a wide trumpet mouth to enlarge the catchment, letting rain flow through the funnel into the tank below; after spray testing and step-by-step improvements, the collector gathers more rain than three plain cups and meets the goal.
6Common mistakes Mistakes
7Quick check Quick check
Q1What material are water bottles usually made of, and why?
Q2What are the properties of glass?
Q3Name one product made of metal.
Q4What is the key to designing a rain collector?
Q5What two things must product design balance?
8Recap Recap
- Products are made of materials like plastic, wood, glass and metal.
- Material properties must match product function.
- Good structural design improves function.
- Good products are both practical and beautiful.
- Design flow: goal, sketch, build, test, improve.