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They are usually obtained from leftover wood.The most common ones are paper,cardboard and cork.

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Cast iron

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-Copper:  Bright, red-coloured metal that has been used since ancient times to make ornaments, coins and weapons.
-Tin : Silver-coloured shiny metal that is very resistant to corrosion.
-Aluminium:  White, cheap and easy to recycle.
-Zinc : Bluish-white in colour and is one of the least common metals.

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Stock forms of metal
- Plates
- Sections
- Ingots
Metals that contain mainly iron are called ferrous metals. Metals that do not have iron in their composition are called non-ferrous metals.”

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They are usually obtained from leftover wood.The most common ones are paper,cardboard and cork.

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The advantages are a lot like they are hardness,the colour,the density,
The disadvantages are: they break easily and they can burn.

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When we process raw material,they become processed materials .

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

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Exercise 10                                                                                                                                                                                                                                           

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Exercise 10                                                                                                                                                                                                                                           

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Car headlight : they are translucent , they are toughnessm and they have a  thermal expansion.

Mattress : they are opaque, they can be soft or hard.

Golf club : they are opaque,  toughness.

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The advantage of the plastic and the wood ones are : they are cheaper and more soft. But they can be broken easily.
The ones that are make of silver and aliminum are more atractive and they are nice to touch. But they are more expensive and unconforteable.

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Umbrella : weight as little as posible, it has to be cheap, they are impermeable, they can be opaque or  transparent.

Chair : can be atractive,  we can buy with, they are  hardness.

Frying pan : to weight as little as posible, they are cheap or expensive, they are opaque and are bad for children.

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Sheep - wool - sweater
Cotton - cotton - t-shirt
Marble - brick - sculpture
Tree - wood - paper
Cow - leather - jacket

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Wool -animal
Marble -mineral
Linen - animal
Clay - mineral
Cork - plant
Sand - mineral
Silk - animal

Wool

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Mechanical properties:
- Hard
- Malleable
- Ductile
- Tough

Thermal properties:
- Good conductor
- They can expand and contract
- Can be soldered

Electrical and magnetic properties:
- Good conductors
Some have a magnetic behavior

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They are usually obtained from leftover wood.The most common ones are paper,cardboard and cork.

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The advantages are a lot like they are hardness,the colour,the density,
The disadvantages are: they break easily and they can burn.

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aluminium because it has all the properties to do it

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aluminium

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.all products used by humans in our daily activities are desgined to perfim their functions correcrtly .

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

When we choose materials we can consier different criters :
. will be strong enough for that obejct
. weighs as litlle as possible
.makes the product looks atractive
.feels nice to touch
. is as cheep as possible
.we can bouild whit asn is avilable an affordable
.is ready available
.is not troxic o contaminated

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they can have different types of properties
. sensory properties
transparent
translucnet
opaque
.mechanical properties
hardness
thoughness
deformability
ductility
malleability
. physical properties
electrical conductivity , thermal conductivity and sound conductivity

thermal expansion

chemical properties

envioremnetal properties

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RAW MATERIALS :
are materials taken directly from nature that we process into other materials to make products with .
NATURAL MATERIALS
we prepare or refine raw materials to obtain natural materials
PROCESSED MATERIALS :
when we processed war materials , they become processed materials , ( also called manufactured materials)
TECHNICAL MATERIALS :
any materials use to contract an object is called a technical materials

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EX 1 PAGE 77
animal : wool , silk
plant : linen , cork
mineral : marble , clay ,
EX 2 PAGE 77
sheep - wool - t-shirt
tree trunk - wood - paper
mineral - marble - worktop
crude oil - plastic - bottle
stone - clay - vase
EX 3 PAGE 77
natural                 processed
slate                       latex
brass                     cork
steel                       lycra
silk

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EX 5 PAGE 77 :
. shoes :
.partition wall :
. streetlight :
. stay cables :

EX 6 PAGE 77 :
UN UMBRELLA : is not toxic or contamined , wheighs as little as posibble
A CHAIR  : is made up of wood and some metal , will be strong  enough for that object
FRYING PAN  : mill be strong enough por taht obejct and is made up of metal and thats rocks .

EX 7 PAGE 77 :
.hardness
.ductility
.malleability
.deformability