technological materials, tools and wood

technological materials, tools and wood

1. Materials and raw materials

   • Selecting materials
     • The type of materials, function, durability, cost of materials, aditional elements and techniques
   • Raw materials
     • Raw materials are products extracted directly fron nature.
   • Natural and processed materials
     • A technical product is an objet made using materials,, designed by humans to meet a especific need

2. The properties of materials

   • Machanical properties
     • Hardness, brittleness
       • Machanical, elasticity
         • Toughness, plasticity
   • Thermal proprties
     • Thermal properties indicate how the materials behaves when subjeted to heat
       • Expansion and thermal conductivity
   • Envirometal properties
     • This properties tell us about the impact materials have on the enviroment
       • Toxicity, recyclability
         • Enviromental hazard, biodegradability

3. Tools

   • The first tools made by humans
     • For many centuries, humans used as tools, until their brains ability for abstract though inspired them to use sticks and stones to make their actions more effective
   • What is a tool?
     • Tools may be defined as objects designed to carry cechanical work and task

4. Wood

   • Parts of the trunk
     • Hearth wood, bark, pith, sapwood, growth rings and cambium
   • Types of wood
     • Non resinius and resinious
   • Obtainig of wood
     • In order to obtain wood, trees must be felled. this actibity is currently regulated by goverments, to provent deforestation and indiscriminate felling