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Copper
This is a bright, red-coloured metal that has been used since ancient times.
Tin
Tin is a silvercoloured shiny metal that is very resistant to corrosion.
Aluminium
Aluminium is the third most common element is the earth crust. It is white, shiny, cheap and easy to recicle.
Zinc
It is bluishwhite in colour and is one of the least common metals.

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Iron
When the percentege of carbon in the alloy is less than 0.1%, we call this material iron.
Steel
Steel is a ferrous material made mainly from iron with 0.1% to 2% carbon.
Cast iron
Cast iron is made from iron and 2% to 6.67% carbon.

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Natural woods- pine, ebony, beech, ash, fir and lime.
Man-made woods- plywood and chipboard.
Wood derivatives- cork and cardboard.

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Classifying metals
Metals that contain mainly iron are called ferrous materials. Metals that do not have iron in their composition are called non-ferrous metals.

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Stock forms of metal

Plates

Sections

Ingots

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Wood derivates
• Paper
• Cardboard
• Cork

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Man-made wood
•Chipboard
•Plywood

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Wood has several properties that are undesirable in technical aplications:

Combustion

Moisture

Rotting and insect attack

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Each material has certain characteristics or properties that make it suited to a certain use.

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Raw materials: the materials that are taken directly from nature that we process into other materials.

Natural materials: raw materials that have been prepared or refined.

Processed materials: materials that have been processed.

Technical materials: Materials that are usedesigned to construct an object.

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To make a statue I would use bronze because is strong.
To make a sardine tin I would  use tin because is not toxic.
To make wires I would use copper because is a good conductor of electricity.

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The metal that we can find in a Coca-Cola can and a Boeing is the aluminium.

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Steel is tougher than cast iron.

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We can use wood as a technical material because is a thermal conductor, it isn´t hard and is light. But wood isn´t flexible and it can break easily.

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Car headlight
Cristal- it´s transparent, hard and it has chemical properties.

Mattress
Foam- it`s opaque, soft, brittle, elastic and it resist to rusting

Golf club
Metal- it's  opaque, hard, tough and is resistant to rusting.

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A plastic chair or a wood chair
The plastic chair is lighter and is easier to get, but the wood chair is more resistant and it`s material doesn`t hurt the environment.

A silver earring or an aluminium earring
The silver is more resistant but the aluminium is easier to get.

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Shoe-  leather. It has to be cheap and weighs.

Partition wall-  bricks. It  has to be strong.

Streetlight- Iron. It has to be strong and readily available.

Stay cables- wire and plastic. It has to be weighs.

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Umbrella
Plastic-it has to be weighs, cheap and readily available.
Fabric- it has to be weighs, available and nice to touch.

Chair
Wood- It has to be  cheap,  available and not toxic.

Frying pan
Metal-It has to be strong, weighs, that we can build with it and it hasn`t to be toxic.
Plastic- It has to be nice to touch, available and cheap.

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Sheep- wool- jumper
Cow- milk- yogurt
Mineral- gold- ring
Chicken- eggs- omelette
Petroleum- plastic- plastic bag.

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Animal         Plant      Mineral

wool            linen        marble
cork         clay
silk           sand