Materials Flashcards
Manufactured materials?
Plastic Metal Paper Brick Card
When choosing a material for a project, what must you ask yourself?
How strong should it be? Rigid or flexible? Light or heavy? Does it need to be weatherproof? Is colour important? What kind of finish will it have?
When you choose a material, what questions do you need to ask?
Is the material available?
What will it cost?
How will you shape and join it?
How long does it take a tree to mature (minimum)
30 years
What type of trees give hard wood?
Broad-leafed, deciduous trees
What does deciduous mean?
Trees that loose their leaves in autumn.
What type of trees do softwoods come from?
Conifers (evergreen trees)
What does evergreen mean?
A tree that keeps its leaves all year round.
Names the parts of a tree (outside to inside)
Bark Growth area Sapwood Annual rings Heartwood
What provides trees with the food they need?
The energy in sunlight
Water minerals
Carbon dioxide
How can you tell a trees age?
The number of annual rings it has.
What is new growth called?
Sapwood
Over a period of years, what happens to a tree?
New layers grow on the outside and the centre hardens to form heartwood.
Where is heartwood found?
At the centre of a tree.
What is heartwood surrounded by?
New layers of sapwood and the bark.
What is the best part of the wood (for manufacturing)
Heartwood
Why is heartwood the best part for manufacturing?
Because of its hardness and strength.
How do trees grow?
By producing cells which are long and thin.
What do we call the pattern of the cells?
The grain
How is wood prepared for used
The water content is reduced to about 10% in a process called seasoning.
What is seasoning?
When the water content (in wood) is reduced to about 10% by leaving it for a few days in a special kiln or over several years by leaving the wood stacked neatly in open air.
What type of wood is easier to cut?
Softwood
What type of wood is harder wearing?
Hardwood
What type of wood grows faster?
Softwood
