Materials

Question 1

What is a modern material?

Answer 1

Materials developed through new/improved techniques, last 100 years

Question 2

Smart material

Answer 2

Material that change properties depending on an outside stimulus E.G. stress, temp, PH, moisture

Question 3

What are Composite materials

Answer 3

Combination of 2 or more materials to produce a new material with combined properties

Question 4

Example of modern composite material

Answer 4

Carbon fibre reinforced polymer ( mix of c fibre + moulded polymer

Question 5

Example of traditional composite material?

Answer 5

Plywood, multiple layers of cross grained veneers (thin slice of wood)

Question 6

Example of a smart material?

Answer 6

thermochromic pigment, shape memory alloys

Question 7

Example of a modern material?

Answer 7

titanium, high strength: weight, resists corrosion

Question 8

Ferrous metal

Answer 8

Metal or alloy that contains iron E.G. steel, usually attract a magnet and usually corrode by rusting

Question 9

Non-ferrous metal

Answer 9

A metal or alloy that does not contain iron. E.G. copper does not attract a magnet, not all corrode

Question 10

What is an alloy?

Answer 10

Mixture of two metals or a metal mixed with other elements, distorts layers of metal, makes tougher

Question 11

What does gsm mean ?

Answer 11

Grams per square metre

Question 12

Define paper and board

Answer 12

Materials manufactured from wood fibre and recycled pulp

Question 13

What gsm is paper ?

Answer 13

Under 200 gsm

Question 14

What gsm is board?

Answer 14

Over 200 gsm

Question 15

Define strength

Answer 15

Ability to withstand forces without breaking

Question 16

Define hardness

Answer 16

Ability to withstand scratching abrasion or denting

Question 17

Define toughness

Answer 17

How easy it is to break or snap

Question 18

Define elasticity

Answer 18

Whether a material can stretch/ bend and then return to its original shape

Question 19

Define malleability

Answer 19

Ability to be bent and shaped

Question 20

Ductility

Answer 20

Ability to be drawn into wires

Question 21

Electrical conductivity

Answer 21

If a material can conduct electricity

Question 22

Thermal conductivity

Answer 22

How easily heat can travel through a material

Question 23

Fusibility

Answer 23

How easy a material is to fuse together or melt E.G. solder has high fusibility

Question 24

Density

Answer 24

Mass per unit volume

Question 25

Absorbency

Answer 25

How good at soaking up moisture

Question 26

What are hardwoods?

Answer 26

Broad leaved deciduous trees, slow growing. Usually but not always hard E.G. oak

Question 27

What are softwoods?

Answer 27

Trees with needle type leaves (coniferous) fast growing

Question 28

What are manufactured woods?

Answer 28

Flat uniform boards made from other woods (grains or layers) of various types

Question 29

Define thermoforming plastics?

Answer 29

Plastics that are easily heated melted and remoulded. Easy to recycle and reuse

Question 30

Give an example of a thermoforming plastic it’s properties and uses

Answer 30

Polypropylene, tough and flexible variety of colours. Plastic chairs-flexibility makes comfort

Question 31

What is a thermosetting plastic

Answer 31

Plastics that undergo a chemical change when heated and moulded, permanently in that shape, cannot be remoulded (hard + rigid) so they are non recyclable

Question 32

Give an example of a thermosetting plastic it’s properties and uses

Answer 32

Epoxy resin rigid durable corrosion resistant, good electrical insulator. Used for circuit boards and wind turbine rotor blades

Question 33

Biodegradable plastics?

Answer 33

Plastics that may break down in air water or decompose in soil

Question 34

Give an example of a biodegradable plastic it’s properties and uses

Answer 34

PLA brittle but strong, used in 3d printing