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Flashcards in materials Deck (17)
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1
Q

definition of natural materials

A

when the materials is made or obtained from a living thing

2
Q

name the properties of silk

A
  • made from silk worm
  • strong textile fibre
  • loosens when wet
  • high tensile due to many bonds in it construction
3
Q

name the properties of wool

A
  • comes from a sheep
  • spun into elastic
  • absorbent
  • fire retarding
  • used in jumpers and insulation
4
Q

definition of synthetic materials

A

man made form chemicals

5
Q

name properties of Nylon

A
  • high strength to weight ratio
  • excellent recovery from deformation
  • used in military uniforms
6
Q

Name the properties of acrylic

A
  • fibre thats cut into short stable lengths and spun into yarn to from a strong, warm fabric
  • used in jumpers and lining for boots and gloves
7
Q

description of density

A
  • density is a measure of how heavy and objects is for as given size
  • the mass of material per unit volume
  • lead, foam and other polymers
  • lead is dense because of its high mass with lots of protons and neutrons
8
Q

description of electrical resistance

A
  • electrical resistance is a ratio of the degree to which an object opposes an electrical current though it
  • measured in ohms
  • rubber
9
Q

description of fusibility

A
  • fusion welding of thermoplasitcals and metals using parent materials are in mixed in a molten state
  • nylon, steal
10
Q

thermal conductivity

A
  • having a low of high thermal resistance depend on heat transfer of material
  • copper is a conductive material
11
Q

elasticity

A
  • the ability to retune to its optional shape

- latex

12
Q

toughness

A
  • tough materials can deform plastically and absorb a lot of energy before breaking
  • Nylon
13
Q

durability

A
  • capable of withstanding wear and tear or decay

- polyester, acrylics and acetate

14
Q

plasticity

A

a material that is able to undergo permanent deformation under load
- clay and plasticine

15
Q

synthetic plastics

A
  • plastics made for cruise oil,, coal, natural gas
16
Q

name some synthetic plastics

A
  • drink bottles (PET)
  • window frames (UPVSC)
  • clothing polyester, nylon
17
Q

advantages of synthetic plastics

A
  • ligthness
  • replying posisiblies
  • less material sued
  • consonant properties and chartiisic for specific use