Technology uses different materials — Technology, 4–6 years
Objects work well when their materials suit their job. Technology, 4–6 years.
The material has a job
Technology is made from things such as wood, metal, glass, rubber or plastic. Each material is chosen because it is useful for a particular part: rubber can bend, glass can let us see through, and metal can be strong. One object may use several materials.
Why choose one material?
People need objects that do their job without hurting us or breaking straight away. A cup made of paper may become soggy, while a glass cup holds water but can smash if it falls. Choosing a material means thinking about what the object must do.
A raincoat
1. The job is to keep rain off a person's clothes. 2. The outside must not let water pass through, so it uses a waterproof fabric. 3. The inside should feel comfortable, so it may use soft fabric. 4. The hood and fasteners help cover gaps. Different materials solve different parts of one problem.
The same material is not always best
It is reasonable to think that a strong object should be made entirely of strong metal. But metal can be heavy, cold and unsafe for every part. A metal spoon may work well, while a metal coat would be uncomfortable. The best choice depends on the object's job.
Look at everyday objects
Look at a pencil, a shoe or a bicycle. Notice that one object may combine hard, soft, smooth and bendy materials. The pencil's wood holds its shape, its graphite makes a mark, and its rubber can remove one. Materials help ordinary objects do their jobs.
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