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Materials and their properties presentation

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Materials and their properties presentation

  1. 1. Materials and their properties.<br />
  2. 2. What are materials?<br />A material is a physical substance used to make things. <br />Metals, plastics, ceramics, glass and fibres are some of the main categories for materials.<br />If we look around, everything we see is made from a material, sometimes more than one ....<br />
  3. 3. For example:<br />The clothes you are wearing are made from fibres.<br />The chair you are sitting on is made from plastic.<br />The windows in the school are made from glass.<br />Can you see any other examples around you?<br />
  4. 4. Properties of materials<br />A property of a material is a description of the characteristics which it has. They are adjectives which tell us about the material.<br />Materials have different properties and characteristics depending on what they are used for. <br />Some materials are hard, others are soft. Some are strong, others are weak.<br />
  5. 5. List of properties<br />Here is a list of the properties which describe different materials:<br />Shiny – It reflects light<br />Strong – It won’t break easily<br />Flexible – It can be bent easily without breaking <br />Light - It doesn’t weigh much<br />Heavy – It weighs a lot<br />Coloured – Has colour<br />Magnetic – It’s attracted to magnets<br />Bendy - Flexible<br />
  6. 6. Hard – Something which can’t be bent easily<br />Brittle – It’s hard but will break easily<br />Malleable – It can be shaped easily<br />Magnetic – It’s attracted to magnets<br />Bendy – Flexible<br />Transparent – Something you can see through<br />Translucent – Something you can partially see through<br />Opaque – Something you can not see through<br />Conductor – It allows heat or electricity to pass through<br />Insulator – It doesn’t allow heat or electricity to pass through.<br />
  7. 7. Which of the previous words could you use to describe:<br />A) a pencil...<br />Hard, light, opaque<br />B) A window<br />Transparent or translucent, hard, brittle<br />C) A piece of paper...<br />Light, opaque, malleable<br />D) A fork...<br />Shiny, hard, magnetic, opaque, conductor<br />
  8. 8. Materials can be categorised into groups. One of the main groups is...<br />Shiny<br />Strong<br />Good conductors of heat and electricity<br />METALS<br />Some are magnetic<br />Usually opaque<br />E,g aluminium, copper, iron, lead...<br />
  9. 9. These properties make metals suitable for many things...<br /> Tools<br />Bridges<br /> Coins<br />Knives, forks and spoons<br />Can you think of any other uses of metals?<br />
  10. 10. Uses and properties..<br />Q) Why is copper suitable for electrical wiring? What properties must it have?<br />- Good conductor<br /> of electricity<br />- It is strong.<br />
  11. 11. Why are saucepans made from metal? Which properties make it suitable for the use?<br />- It is a good conductor or heat.<br />- It is It does not melt with high temperatures.<br />- It is strong<br />