Materials Flashcards
1
Q
describe tension force and example products
A
- when an object is stretched/pulled apart in opposite directions
- springs in a trampoline have high tensile strength - they resist being permanently stretched and return to their original length to throw you back into air
- suspension bridges use springs to support weight of the bridge
2
Q
describe compressive force and example products
A
- when an object is squashed due to compressive forces directed at one another
- occurs when a material supports weight above it eg. chair legs+ bridge supports
3
Q
describe shear force and example products
A
- causes parts of an object to slide past one another
- scissors/industrial cutting machines use shear force to cut materials
4
Q
describe torsion force and example products
A
- when an object is twisted
- propeller shafts resist torsion - allows them to transfer rotary motion without breaking/twisting
- wringing water out of cotton towels
5
Q
describe the primary processing of paper
A
- trees are cut down and taken by lorry to a paper mill
- the bark is stripped off
- the wood is cut into smaller pieces by a chipper
- the bits of wood go through chemical or mechanical pulping
- the pulp is washed and bleached to desired colour
- the pulp is pressed flat between rollers, dried, and cut to size
6
Q
describe the sizes of paper and how they relate to each other
A
- sizes start of A0 and half in size/area each time
- e.g. A4 is half the size of A3
7
Q
describe the properties and use of cartridge paper
A
- high quality & has a textured surface
- good for sketching with different drawing materials (pencils, crayons, inks)
8
Q
describe the properties and use of layout paper
A
- thin+ translucent
- good for general design work/ sketching ideas
9
Q
describe the properties and use of tracing paper
A
- semi-transparent
- used to copy images
10
Q
describe the properties and use of grid paper
A
- has a square grid/ isometric pattern printed on it
- grid - orthographic+ scale drawings
- isometric - isometric drawings
11
Q
describe the properties and use of bleed-proof paper
A
- used when drawing with felt-tips/ marker pens
- ink does not bleed (spread out)
12
Q
describe the properties and use of foil-lined board/ tetrapak
A
- board with an aluminium foil lining
- used for food packaging - foil keeps flavours in and air+moisture out
13
Q
describe the properties and use of foam core board
A
- expanded polystyrene foam is sandwiched between two thin layers of card - increases strength+ rigidity by lamination
- stiff+ lightweight, outer card layers can be scored
- used for making models, mounting posters
14
Q
describe the properties and use of duplex board
A
- one side is solid white board - visible side, smooth for printing, high quality
- one side is cardboard
- used for food packaging
- outside appears high-quality
- cheaper as one side is cardboard
15
Q
describe the properties and use of corrugated card
A
- made of a fluted inner core sandwiched between two outer layers/liners
- the flutes add strength/rigidity by lamination - used for secondary packaging to protect products during transit
- air held in fluted layer provides insulation+ cushioning
- outer liners can be printed on
- is flexible/can be bent without breaking but is rigid enough to keep its shape
- negative - stronger materials are bulkier so could increase transport costs
- used for food packaging (pizza boxes), delivery boxes
