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DT > Unit 3 > Flashcards

Unit 3 Flashcards

1
Q

In the past what were ships made of?

A

They were made of wood

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2
Q

What does felled mean?

A

It means that a tree is cut down

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3
Q

Where does softwood come from?

A

It comes from coniferous trees

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4
Q

Where does hardwood come from?

A

It comes from deciduous trees.

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5
Q

Why is softwood a bit better than hardwood?

A

Because softwood grows faster than hardwood and it is cheaper

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6
Q

What is good about hardwood?

A

It is sought after for its variety if colours and grains, it has good aesthetically and physical properties. It has a closer grain making it more dense and hard wearing

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7
Q

What are the properties of Ash wood?

A

It is very tough but also flexible and shock resistant

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8
Q

What are the properties of Beech wood?

A

Beech is tough and very durable with a fine finish

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9
Q

What are the properties of Oak wood?

A

Oak is tough, hard and durable with a variable grain

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10
Q

What is balsa?

A

Balsa is a wood which is soft and lightweight

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11
Q

Is balsa a softwood or hardwood?

A

It is a hardwood but has many softwood properties

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12
Q

What is special about Mahagony?

A

It is a type of wood sought after for its deep rich reddish colour

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13
Q

What are the properties of pine?

A

It is lightweight and easy to work with

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14
Q

What are the properties of larch?

A

It is durable, tough and has good resistance

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15
Q

What are the properties of spruce?

A

It has a high stiffness to weight ratio

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16
Q

What are the properties of cedar?

A

It contains natural oils which offer natural water resistance

17
Q

Where is spruce commonly used?

A

It is commonly used in violins, piano and guitar families of instruments

18
Q

What is oxidation?

A

It is when a surface reacts with oxygen

19
Q

What is an alloy?

A

A mixture of a metal and another substance

20
Q

What can metals be categorised as?

A

Ferrous and Non - Ferrous metals

21
Q

What is common about all ferrous metals?

A

They all contains iron

22
Q

What are the properties of ferrous metals?

A

Most of them are magnetic and will rust if exposed to moisture without a protective finish

23
Q

What are the properties of non-ferrous metals?

A

This group of pure metals are generally not magnetic and does not contain iron. Non ferrous metals do no rust but they can oxidise

24
Q

What are some examples of ferrous metals?

A

Mild steel
Carbon steel
Cast iron

25
Q

What are thermoforming plastics?

A

They are plastics that can get more flexible as it is heated. It can shape and be reformed multiple times

26
Q

What are thermosetting plastics?

A

They are plastics that remain rigid and once they have been formed they cannot reform

DT (4 decks)

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