core materials

Question 1

advantages of cotton

Answer 1

cool, absorbent, withstand frequent washing at high temperatures

Question 2

disadvantages of cotton

Answer 2

creases easily, shrinks, dries slowly

Question 3

physical properties of cotton

Answer 3

grown on a cotton plant in a ball called a boll
fibres are combed and spun into a yarn

Question 4

advantages of polyester resin

Answer 4

can be cast with glass fibres to make lightweight and very strong products
can be polished to a high finish

Question 5

disadvantage of polyester resin

Answer 5

can chip if dropped

Question 6

uses of polyester resin

Answer 6

boat hulls
sports car bodies
can be cast into decorative objects

Question 7

properties of polyester resin

Answer 7

brittle, rigid, good electrical and thermal insulator

Question 8

what type of wood is balsa

Answer 8

hardwood

Question 9

advantages of balsa wood

Answer 9

lightweight
easy to cut

Question 10

disadvantage of balsa wood

Answer 10

much too soft and week for most products

Question 11

uses of balsa wood

Answer 11

model making, primary school products, surf board cores

Question 12

what type of wood is beech

Answer 12

hardwood

Question 13

advantages of beech wood

Answer 13

a tough wood
does not crack or splinter easily
hard

Question 14

disadvantage of beech wood

Answer 14

expensive
not very resistant to moisture
not good for exterior use

Question 15

uses of beech wood

Answer 15

toys, laminated or solid furniture

Question 16

advantages of copier paper

Answer 16

takes colour well
good surface for pencils, pens and markers
readily available in lots of colours

Question 17

disadvantages of copier paper

Answer 17

prone to jamming printer feed mechanisms

Question 18

properties of copier paper

Answer 18

thin, lightweight, cheap, bleached, smooth uncoated surface

Question 19

properties of cast iron

Answer 19

brittle, good in compression, magnetic, rusts easily

Question 20

uses of cast iron

Answer 20

machine parts, brake discs, manhole covers, vices

Question 21

properties of mild steel

Answer 21

tough, ductile, malleable, magnetic, poor corrosion resistance

Question 22

uses of mild steel

Answer 22

screws, nails, bolts, car body panels,

Question 23

properties of aluminium

Answer 23

corrosion resistant, malleable, ductile, easily machined, good heat/electrical conductor, excellent strength to weight ratio, polishes well

Question 24

uses of aluminium

Answer 24

air craft, foil, drinks cans, engine parts, window frames

Question 25

describe conductive inks

Answer 25

- contain pigments that allow small currents to flow through even when dry - used in a pen on any suitable material - Made with silver, carbon, graphite or other precious metal-coated base material

Question 26

uses of conductive inks

Answer 26

- drawing working circuits on polyester or paper - improvising or repairing circuits on printed circuit boards - printing RFID tags for tickets etc

Question 27

advantages of conductive inks

Answer 27

- easy to use - lighter and more economical than traditional circuit boards - low waste - ink can be folded, so you can draw a circuit, fold the paper and unfold it to find the circuit still works

Question 29

what is a pulley

Answer 29

grooved wheel with a belt running in the groove - used to control how fast something turns - make lifting things easier