section a

• Name an alloy

  Examples

  Brass

  bronze

  stainless steel
• Explain the disadvantages of extracting non renewable resource

  • Pollution can occur when extracting non renewable resoruces to from the ground such as mining of coal
  • increased amount of c02 in the atmosphere
• what is a technical textile and examples

  kevlar,conductive fabrics
• thermoforming polymers

  • dont resist heat ( easily formed into different shapes)
  • acrylic,(hard stiff and shiny used for baths)
  • (poly propene) tough and flexible - used in plastic chairs
• thermosettig polymers

  • resist heat and fire well
  • chan be moulded
  • exposy resin ( rigid durable and used in electric circuits)
  • polyester resin ( hard still and used in glass)
• working properties of a material

  • malleability - materials that can be bent and stength
  • ductility - can be drawn into a wire
  • elastcity - strecth and return to original length
  • hardness - scratching abraison
  • strength - ability to withstand forces
• physical properties

  fusibility - low melting and boiling points

  density

  absorbency - how well it absorbs water

  electrical and thermal conductivity
• crowd funding

  • way of boosting money
  • no start up fees
  • used to promote an idea to large number of peoples
• co-operative

  a business ran and managed by its owners
• manfactured board

  plywood
• advanatges of MDF boards

  • whole tree is used
  • better for environment
• softwoods

  pine

  larch

  spruce
• hardwoods

  oak

  mahgonay

  beech

  balsa

  ash
• just in time manufacturing advanatges

  • materials don't become out of date/reducing watse
  • no need for larger factories reducing waste cost
• boards

  foil lined - packing food,keeps flabvour in and moisture out

  corrugated - fluted inner core which adds strength and rigidity

  duplex board - used in food packing

  solid white board - used for primary packing

  ink jet card - allowed for images to be defined
• papers

  cartridge used for drawing materials

  layout - general design work and sketching images

  tracing papers - semi transparent

  grid - used in orthographic drawings

  bleed proof - used by designers drawing felt tips
• advanatges of natural fibres

  cotton - strong,cheap,absorbent

  wool - warm absorbent and good elasticity

  silk 0- smooth, absorbent

  all bio degradable
• disadvantages of natural fibres

  • high flammitliy,poor elasticity - cotton
  • wool - shrink when washed and is expensive
  • silk creases when wet