materials Flashcards
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
