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    Materials Materials Presentation Transcript

    • Why do we use different materials to make different things ?
    • Why do we use different materials to make different things?
      • Different materials have different characteristics:
      • Properties (weight, hardness, elasticity, …)
      • Price
      • Appearance
      • Availability
      • Easiness/difficulty of use
      • Effects on health
      • Effects on environment
    • Most important types of materials Metals (eg steel, copper) Wood (eg oak, MDF) Plastic (eg vinyl, PVC) Fabric (eg cotton, polyester) Ceramic (eg clay, porcelain)
    • Some important properties
      • Colour, shininess
      • Weight, density
      • Strength, toughness, hardness, brittleness
      • Feel, texture
      • Resistance to heat, resistance to corrosion
      • Conductivity/insulation (electrical or heat)
      • Flexibility
      • Ability to see through: opaque, translucent, transparent
      • Elasticity, plasticity
      • Malleability
      • Ductility
    • Which materials would you use for these objects? Why?
      • Chair
      • Pan
      • Book
      • Wire
      • Jacket
      • A CHAIR could be made of wood because
      • The wood has a good appearance
      • It is strong, tough
      • It can be environmentally friendly (it depends on the type of
      • wood)
      • It is not usually expensive (it depends on the type of wood)
      • But if we want a CHAIR for the outside, maybe it is better to make it of plastic :
      • The plastic has a better resistance to humidity,
      • so it will last longer
      • It has some flexibility, so the chair can be more
      • confortable
      • It is cheaper than wood
      • It is not as heavy as wood
      • A PAN is made of metal because:
      • It is a good conductor of heat, so when it on the fire it can transmit the heat to the meat we put on it.
      • But at the same time, it has a good resistance to heat, so it does not melt when it is on the fire
      • We can make the handle of plastic , because it is a good insulator of heat and it has a good texture
      • A Book is made of paper (and cardboard) because:
      • It has a good texture, so it is nice to touch
      • It can be easily printed and we can write on it if necessary
      • It is flexible, so we can fold the pages if necessary
      • It is not too heavy, so we can carry it wherever we want
      • A WIRE is made of metal (usually copper), because:
      • It is a good conductor of electricity
      • It is ductile, so we can make easily wires from this kind of material
      • It is flexible, so we can bend it to make an electric circuit
      • And they are usually covered by plastic , because:
      • It is a good insulator of electricity, so we can avoid short circuits when two wires are together and shocks when we touch them
      • A JACKET could be made of fabric because:
      • It is a good insulator of heat, so we are warmer when we wear it
      • It is flexible, so we can easily put it on and off
      • It is not too heavy, so we can carry it on without effort
      • It has a good texture, so it is nice to touch