Materials ok without corrections

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Materials ok without corrections

  1. 1. Why do we use different materials to make different things ? Javier Gómez Calzada 1ºESO, 3ºESO
  2. 2. Why do we use different materials to make different things? <ul><li>Different materials have different characteristics: </li></ul><ul><li>Properties (weight, hardness, elasticity, …) </li></ul><ul><li>Price </li></ul><ul><li>Appearance </li></ul><ul><li>Availability </li></ul><ul><li>Easiness/difficulty of use </li></ul><ul><li>Effects on health </li></ul><ul><li>Effects on environment </li></ul>
  3. 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. 4. Some important properties <ul><li>Colour, shininess </li></ul><ul><li>Weight, density </li></ul><ul><li>Strength, toughness, hardness, brittleness </li></ul><ul><li>Feel, texture </li></ul><ul><li>Resistance to heat, resistance to corrosion </li></ul><ul><li>Conductivity/insulation (electrical or heat) </li></ul><ul><li>Flexibility </li></ul><ul><li>Ability to see through: opaque, translucent, transparent </li></ul><ul><li>Elasticity, plasticity </li></ul><ul><li>Malleability </li></ul><ul><li>Ductility </li></ul>
  5. 5. Which materials would you use for these objects? Why? <ul><li>Chair </li></ul><ul><li>Pan </li></ul><ul><li>Book </li></ul><ul><li>Wire </li></ul><ul><li>Jacket </li></ul>Use the words Write a sentence using each of 22 properties in the previous slide. Be sure you know its translation to Spanish.
  6. 6. <ul><li>A CHAIR could be made of wood because </li></ul><ul><li>The wood has a good appearance </li></ul><ul><li>It is strong, tough </li></ul><ul><li>It can be environmentally friendly (it depends on the type of </li></ul><ul><li>wood) </li></ul><ul><li>It is not usually expensive (it depends on the type of wood) </li></ul><ul><li>But if we want an outdoor CHAIR, maybe it is better to make it of plastic : </li></ul><ul><li>The plastic has a better resistance to humidity, </li></ul><ul><li>so it will last longer </li></ul><ul><li>It has some flexibility, so the chair can be more </li></ul><ul><li>confortable </li></ul><ul><li>It is cheaper than wood </li></ul><ul><li>It is not as heavy as wood </li></ul>

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