materials

Question 1

definition of natural materials

Answer 1

when the materials is made or obtained from a living thing

Question 2

name the properties of silk

Answer 2

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

Question 3

name the properties of wool

Answer 3

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

Question 4

definition of synthetic materials

Answer 4

man made form chemicals

Question 5

name properties of Nylon

Answer 5

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

Question 6

Name the properties of acrylic

Answer 6

• 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

Question 7

description of density

Answer 7

• 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

Question 8

description of electrical resistance

Answer 8

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

Question 9

description of fusibility

Answer 9

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

Question 10

thermal conductivity

Answer 10

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

Question 11

elasticity

Answer 11

• the ability to retune to its optional shape

- latex

Question 12

toughness

Answer 12

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

Question 13

durability

Answer 13

• capable of withstanding wear and tear or decay

- polyester, acrylics and acetate

Question 14

plasticity

Answer 14

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

Question 15

synthetic plastics

Answer 15

• plastics made for cruise oil,, coal, natural gas

Question 16

name some synthetic plastics

Answer 16

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

Question 17

advantages of synthetic plastics

Answer 17

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