Materials ok without corrections
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Materials ok without corrections

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Presentation about materials without the correction of the activities

Presentation about materials without the correction of the activities

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  • 1. Why do we use different materials to make different things ? Javier Gómez Calzada 1ºESO, 3ºESO
  • 2. 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
  • 3. 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)
  • 4. 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
  • 5. Which materials would you use for these objects? Why?
    • Chair
    • Pan
    • Book
    • Wire
    • Jacket
    Use the words Write a sentence using each of 22 properties in the previous slide. Be sure you know its translation to Spanish.
  • 6.
    • 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 an outdoor CHAIR, 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