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tecnology gcse > woods and metals and plastics > Flashcards

woods and metals and plastics Flashcards

1
Q

2 types of soft woods and what type of three is this

A

-pine
-red wood
-deciduous
-grow quickly
-less dense
-cheap

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2
Q

2 types of hard woods and what type of three is this

A

-mahogany
-beach
-evergreen
-expensive
-slow growing
-dense

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3
Q

2 types of man made

A

-ply
-chipboard
-MDF - medium density fiberboard
made from left over pieces of wood stuck together

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4
Q

adv of man made bourd

A

-comes in large sheets
-no natural defects

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5
Q

dis of man made bourd

A

-edges need finished
-vener needed added to improve overall looks

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6
Q

what are the components of ferrous metals

A

-rust
-magnetic
-contains iron

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7
Q

examples of ferrous metals

A

-carbon steal
-stainless steel
-mild steal

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8
Q

what are the components of non ferrous

A

-doesn’t rust
-not magnetic
-doesn’t contain iron

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9
Q

examples of non ferrous

A

-brass
-copper
-aluminium

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10
Q

properties of thermo plastics

A

heated and shaped multiple times

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11
Q

examples of thermo plastics

A

-melemine
-polyestor resin
-epoxy resin

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12
Q

properties of thermo setting plastic

A

plastics that can only be heated and shaped only once

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13
Q

examples of thermo setting plastics

A

-acrilic ridged
-polyester
-nylon
-pvc

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14
Q

what is tensile

A

pulling

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15
Q

what is tersisih

A

pushing

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16
Q

what is compression

A

compressing

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17
Q

bending strength

A

bending

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18
Q

what is hardness

A

the ability of the material to resist scratching from wear and tear bending and indenting

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19
Q

what is brittle

A

not able to stand much stretching but will break rather than change shape

20
Q

what is toughness

A

this is the opposite of brittle it is the ability to resist breaking or shattering

21
Q

what is durability

A

to repeatedly with stand receded use wear and tear and corrosion attack

22
Q

what is ductile

A

the ability for a material to change shape
ussually streaching

23
Q

which material is the strongest in the world and some facts about it

A

-graphite
-thinnest in the world
-most conductive material
-it is almost transparent

24
Q

explain the process of heat treatment

A

-heat treatment is the change shape eating and cooling of metals to change their physical properties without letting it

25
Q

what are ferrous metals

A

-rusts
-magnetic
-contains iron

26
Q

what are no ferrous metals

A

-doesn’t rust
-not magnetic
-doesn’t contain iron

27
Q

describe what a but joint is

A

||______
||——–
-jointed ends on
-the glue is the only hold
-weakest wood

28
Q

describe what a dowel joint is

A

-dowel added to the end for more support
-use pillar drill to use the hole
-add the dowel and glue joint

29
Q

describe what a mitre joint is

A

-cut at 45 degree angle
-increases surface area to glue it
-only for corners
-stronger joint than butt

30
Q

describe what a housing joint is

A

-mainly used in shelving
-cut a piece out so the other piece can sit in it

31
Q

what does permanent mean

A

cannot be undone without damaging the material

32
Q

what does semi permanent

A

can be done without damaging the material

33
Q

ways that you can join metals

A

-soldering
-brazing
-welding

34
Q

what are the steps of vacume forming and what its used for

these are key point that your should know
-hard strong surface
-slope or strait lines
mold has to be higher melting point than plastic

A

vacuum forming is to for food trays shop fitting and bath

put the mold in the mashine
put the plastic over the mashine
make the mold tight
heat the plastic
raise the mold
suck the air out
wait till cool
remove the mold

35
Q

what are the steps of blow molding

A

-parson inserted to the mold and then heated
-base of parson squashed by mold
-air blown into a parson expands to fill the mold
-finish product

36
Q

what is press molding

A

-a mold is made by 2 halves sheet of plastics plastic is placed in 2 halves which are then heated and pressure is applied enabling the plastic to assume the shape

37
Q

what is laminating

A

wood is bent by laminating this is done by cutting thin strips of wood putting glue on strips and clamping then into mold
-steam is used

38
Q

what is strength

A

The ability of a material to stand up to the force being applied without it bending breaking shattering or deformed in anyway

39
Q

what is hardness

A

the ability of a material to resist scratching from wear and tear bending and indenting

40
Q

what is brittleness

A

brittle materials cannot withstand much stretching they will break rather than change shape.

41
Q

what is toughness

A

this is the opposite of brittle it is the ability to resist breaking or shattering

42
Q

what is durability

A

the ability to withstand repeated use,weathering and corrosion attach

43
Q

what is ductility

A

the ability of a material to change shape (usually) stretching

44
Q

how to bend plastic

A

-mark bend with non permanent and a dashed line
-line the bend line up with the wire of the line bender/strip heater
-wait until plastic is soft
-bend to desired angle
-hold until cool

45
Q

how to bend metal

A

-mark bend line with a scriber and a dashed line
-line up the bend with the folding bars on top of a vice
-use scrap wood and a hammer to bend the metal to desire angle

tecnology gcse (8 decks)

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