CHARACTERISTICS OF MATERIALS
QCA Unit number 3C
WHAT'S THE BIG IDEA?
 Materials are the 'stuff' the world is made up of. Materials
are all different. Some are strong, or hard, or transparent. Some
are weak, or soft, or opaque.
We pick a material to do a job because it will be good at it.
Windows would be no good if you couldn't see through them. A chair
would be useless if it collapsed when you sat on it.
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 So we choose materials that are
right for the job. We may shape or change them. We may even make
new materials that will fit the task. We test materials to make
sure that they are strong enough, or bendy enough, or absorbent
enough, for the job. |
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