resistant materials

Question 1

what does plastic memory mean?

Answer 1

Plastic memory – when reheated thermoplastics try to return to their previous shape.

Question 2

what does thermoplastics mean?

Answer 2

Thermoplastics – plastics which soften when heated, harden when cooled and can be heated and softened again many times.

Question 3

what does thermosetting plastics mean?

Answer 3

Thermosetting plastics – plastics which after being heated and softened during manufacture, cannot be changed or softened by heating again.

Question 4

what does CAD mean?

Answer 4

CAD – computer aided design

Question 5

what does CAM mean?

Answer 5

CAM – computer aided manufacture

Question 6

what does recycling mean?

Answer 6

Recycling – re-processing waste or unwanted materials and turning them back into useable material.

Question 7

whats a pillar drill?

Answer 7

Pillar drill – a machine used to make different sized holes in a number of materials.

Question 8

whats a line bending?

Answer 8

Line bending – using a single line of heat to bend plastic.

Question 9

what are plastics made from?

Answer 9

oil

Question 10

what are the particles like in plastic?

Answer 10

in very long chains

Question 11

whats polymerisation.?

Answer 11

the process of producing long plastic atom chains

Question 12

what are the 2 main groups of plastics?

Answer 12

thermoplastics and thermo setting plastics

Question 13

what are the properties of thermoplastics?

Answer 13

they are less resistant to heat and fire than thermo setting plastic and don’t undergo a chemical change during being heated so you can reshape them and reheat them after they’ve been formed and they will return to their original form

Question 14

what are the properties of thermo setting plastics?

Answer 14

they undergo a chemical change when being heated and are more resistant to heat and fire and can’t be moulded . they are stronger, harder and more stiffer

Question 15

whats plastic memory?

Answer 15

when you can heat plastic and shape it and reheat it and it will return to its original form

Question 16

what are common examples of plastics used in schools?

Answer 16

acrylic and polistyrene which are thermoplastics and come in many colours and thicknesses but acrylic is brittle

Question 17

what are advantages of CAD?

Answer 17

commonly used industry which you can save your work and easily make changes without having to draw the whole thing again

Question 18

what are advantages of CAM?

Answer 18

It is useful when making more than one product, eliminating human error and ensuring all products are identical.

Question 19

what are disadvantages of CAD and CAM?

Answer 19

One of these is that by using CAD/CAM fewer workers are required and as a result unemployment rises.

Question 20

what are disadvantages of plastic?

Answer 20

they are non-biodigradible causing problems disposing of them

Question 21

what are we doing about the problems of plastic?

Answer 21

we are recycling and plastics tell you on the bottom if they are recyclable and numbers on the bottom make them easier to sort