Materials

Question 1

what is the method for making paper

Answer 1

1. tiny chips of wood are cooked in chemicals and water to create a mushy pulp
2. the pulp is poured of a fine mesh
3. the water drains away and the fibres link together when they touch
4. the fibres are sent through rollers which squeezes out any excess water which strengthens the fibres

Question 2

list four types of board

Answer 2

cardboard
carton board
mounting board
corrugated board

Question 3

how is normal board made

Answer 3

gluing layers of pulp papers

Question 4

how is thick board made

Answer 4

stick together sheets of paper

Question 5

define timber

Answer 5

the general name for wood materials

Question 6

list 3 general facts about hardwoods

Answer 6

. slow growing
. normally hard but can be soft and weak
. can be machined into a variety of standard sizes

Question 7

list 3 general facts about softwoods

Answer 7

. generally smaller in standard size
. grow faster
. supplied in standard sections

Question 8

what are the 5 things that must be considered when choosing wood

Answer 8

. grain pattern
. colour
. texture
. workability
. structural strength

Question 9

what are the 9 things that must be considered when choosing a metal

Answer 9

. elasticity
. ductility
. malleability
. hardness
. work hardness
. brittleness
. toughness
. tensile strength
. compressive strength

Question 10

define elasticity

Answer 10

. the ability to regains its original shape after it has been deformed

Question 11

define ductility

Answer 11

. the ability to be stretched without breaking

Question 12

define malleability

Answer 12

. the ability to be pressed, spread and hammered into shapes

Question 13

define hardness

Answer 13

. resistance to scratching cutting and wear

Question 14

define work hardness

Answer 14

. a change in the hardness of the metal due to repeated hammering or strain

Question 15

define brittleness

Answer 15

. the ability to break easily with little bending

Question 16

define toughness

Answer 16

. resistance to breaking, bending or deforming

Question 17

define tensile strength

Answer 17

. strength when stretched

Question 18

define compressive strength

Answer 18

. strength when under compression