Unit 2

Unit 2

1. Raw materials

   • Are products extracted directly from nature, there are three types
     • Animal origin
     • Plant origin
     • Mineral origin

2. Natural and processed material

   • Industrial processes are applied to raw materials, also know as natural resourcesd, to turn them into processed materials. these processed materials are then used to make other, more complex objects. for example, the wood from trees is made into planks, wich are used to buil furniture

3. Properties of materials

   • The propierties of materials describe their qualities. wich determine their behavior when subjected to external forces

4. Tools

   • The humans can use their hands to create tools.

5. Wood working tools

   • Mallets
   • Hacksaws
   • Hammers
   • Spanners
   • Handsaws
   • Machine tools
   • Screwdrivers

6. Types of wood

   • Non-resinous
   • Resinous

7. Popierties of wood

   • ·Hardness ·Thermal and electrical insulator ·Flexibility ·Density ·Hygroscopity ·Sound conductivity ·Splitability ·Toughness

8. Forms of wood

   • Strips
   • Boards
   • Panels
   • Mouldings/Profiles
   • Beams
   • Sheet

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