When polyester is mixed with cotton we get a new mixture, polyester cotton. It washes easily, dries quickly and irons easily. Denim material is also mixed with Lycra, which yields a strong material that can stretch.
ASSIGNMENT 11 (INDIVIDUAL)
- Look at the labels on your clothes at home and see which materials are used. Try to find as many composite (mixed) materials as possible.
Natural Substances | Synthetic Substances |
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More and more materials are being mixed to supply increasing demands. Not all mixtures are manmade however. Bone, for instance, is a natural mixture.
MATERIAL | MADE FROM | USES | ADVANTAGES |
Bone | Calcium phosphate +Protein fibres | Skeleton | Harder than protein. More flexible than calcium phosphate. |
Reinforced concrete | Concrete mixture + steel reinforcing rods | Construction | Stronger than concrete.Cheaper and lighter than steel. |
Glass fibre | Plastic + glass fibres | Boats, caravans | Stronger than plastic.Less fragile than glass. |
Carbon fibre reinforced with plastic | Carbon fibre + plastic | Golf clubs, fishing rods, tennis rackets, aircraft parts | Cheaper than pure carbon fibre.Much stronger than plastic. |
Tyres | Rubber + rayon/steel wires | Tyres for cars, motor cycles | Stronger than rubber.Still elastic and flexible. |
Laminated wood | Various layers of wood | Laminated wood | Cheaper than solid wood.Doesn’t warp as easily as solid wood. |
- Identify and research another five examples of mixtures that play an important role in the modern, technological world.
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Assessment
Learning Outcome 1: Learners respond confidently to their desire to learn about natural phenomena; they investigate relationships and solve problems within the context of science, technology and the environment.
Assessment Standard 1.2: We know this when the learner conducts investigations and collects data: conducts simple tests or surveys and records observations or responses.
Assessment Standard 1.3: We know this when the learner evaluates data and communicates findings: relates observations and responses to the focus question.
Learning Outcome 3: Learners are able to show understanding of the interrelationships between science and technology, society and the environment.
Assessment Standard 3.2: We know this when the learner understands the impact of science and technology: suggests ways to improve technological products or processes and to minimise negative effects on the environment.