How do smart, modern and composite materials let designers do new things?
Smart materials that respond to a change in their environment, modern materials developed through new processes, and composite materials that combine two or more materials for improved properties.
A focused answer to the WJEC GCSE Design and Technology core technical principle on developments in materials, covering smart materials that respond to their environment, modern materials made by new processes, and composites that combine materials to improve properties.
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What this topic is asking
WJEC's core content includes developments in materials: smart materials, modern materials and composites. These let designers solve problems that traditional timbers, metals, polymers and textiles cannot. This is core knowledge for Unit 1 across all routes; you need to name examples, say what each one does, and link it to a product.
Smart materials
The exam reward is always the same pattern: name the smart material, say what change it responds to, and give a product that uses that behaviour.
Modern materials
Composite materials
Why these materials matter to design
Try this
Q1. Name a smart material and state what change it responds to. [2 marks]
- Cue. Thermochromic (temperature), photochromic (light), shape memory alloy (heat), piezoelectric (force).
Q2. Give one advantage and one disadvantage of using a composite such as carbon fibre. [2 marks]
- Cue. Advantage: high strength for low weight. Disadvantage: expensive and hard to recycle.
Exam-style practice questions
Practice questions written in the style of WJEC exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
WJEC-style4 marksExplain, using two examples, how smart materials can improve everyday products.Show worked answer →
A four mark Explain question needing two developed examples. Example one, thermochromic material changes colour with temperature, used on a baby's spoon or a kettle to warn that something is hot (2 marks for the example plus its benefit). Example two, shape memory alloy returns to a set shape when heated, used in spectacle frames that spring back after bending, or in dental braces that pull teeth gently as they warm in the mouth (2 marks). Markers reward naming a real smart material, stating what it responds to, and linking it to a product benefit. A common error is to name the material without saying what change it responds to.
WJEC-style3 marksExplain why carbon fibre reinforced polymer is used for racing bicycle frames.Show worked answer →
A three mark Explain question about a composite. Carbon fibre reinforced polymer combines strong carbon fibres in a tough resin, giving a very high strength-to-weight ratio, so the frame is extremely stiff and strong yet light (1 mark), which helps the rider go faster for less effort (1 mark). It can also be moulded into aerodynamic shapes that metal tubes cannot easily achieve (1 mark). A weaker answer just says it is strong without mentioning that it is also light, which is the key reason for racing use.
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