Working with materials

Materials

1. Working with materials It takes 20 days to be descomposed It takes more than 100 years It takes more than 4000 years

2. The classification of materials The objects we use in our everyday life are manufactured from different types of materials . Wood Steel Plastic Glass Wool Marble

3. The classification of materials Many of these materials are originated in nature . Wood Cork Wool Petroleum Iron Gold Clay Marble Cotton

4. The classification of materials And we call them raw materials . Raw materials are substances that are extracted directly from nature . Raw materials can be classified into three categories : Animal origin : wool , silk … Vegetable origin : cotton , wood , cork , linen … Mineral origin : marble , clay , iron …

5. The classification of materials However , in the production of objects , materials can´t be used as they are found in nature . tree trunk board Raw materials are subjected to modifications , to some kinds of transformations

6. The classification of materials The materials resulting to these transformations are called processed materials . tree board plastic petroleum sheep wool iron ore steel block

7. The classification of materials With the processed materials , humans create manufactered goods . board plastic wool steel block A manufactered goods is any object created by humans to satisfy their needs and improve their standard of living.

8. The classification of materials With the processed materials , humans create manufactered goods . NATURAL RESOURCES RAW MATERIALS PROCESSED MATERIALS MANUFACTERED GOODS RECYCLED MATERIALS

9. Technical materials From a technical point of view , the materials we use to product objects can be classified into five groups . Wood is a natural material that comes from trees . METAL WOOD Metals come from minerals extracted from mines.

10. Technical materials Plastic is a synthetic material obtained primarily from petroleum PLASTIC Some of textile materials are obtained from raw materials ( silk , cotton …) TEXTILE MATERIALS The great majority are syntethic ones ( rayon , polyester …)

11. Technical materials Stone materials are natural in origin . They consist primarily of stone and sand . They consist mainly of clay . CERAMIC MATERIALS STONE MATERIALS Ceramic materials are natural in origin too .

12. Technical materials These technical materials the are used : To produce the objects we use in our everyday life To construct all kinds of machines To build houses , bridges, parks …