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16 Cards in this Set
- Front
- Back
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types of wood
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the three types are hardwoods, softwoods and manufactured board
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what trees do hardwoods come from
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deciduous or leaf losing trees
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where do softwoods come from
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coniferous or cone bearing trees
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name a hardwood
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Oak, mahogany, beech
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a common problem with some woods
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properties of hardwoods
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the fibres are smaller and more compact giving them greater density
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the growth difference
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hardwoods can take 100 years to mature, whereas softwoods grow much quicker
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where do manufactured boards come from
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they are man made. Mdf and chip board are made from waste product, ply wood is made from layers of veneers glued together
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the three types of metals
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ferrous, non ferrous, alloys
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what are ferrous metals mainly made out of
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mainly composed of ferrite or iron
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ferrous metals will usually rust
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this is because they contain iron which reacts with oxygen
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examples of ferrous metals
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mild steel, stainless steel, carbon steel
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non Ferrous metals consist of pure metal
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metals such as aluminium, copper, zinc
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properties of metals
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shiny, malleable, ductile, conduct heat and electricity, some ferrous metals are magnetic
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alloys
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formed by 2 or more metals
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why use alloys
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they can add features such as increased hardness.
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