Material & Properties

Question 1

Objects are made of which materials?

Answer 1

Natural Materials: originate in nature & has no process
Raw Materials: originate in nature & comes from natural materials (E.g. wood, clay)
Processed Materials: modifies the material
Recycled Material: reused with transformation processes

Question 2

What is used for the traditional & the industrial process?

Answer 2

Industrial process: Processed materials

Traditional process: Raw materials

Question 3

What are the materials classified into?

Answer 3

Wood, metal, plastic, stone and ceramic materials & textile materials.

Question 4

What are wood materials?

Answer 4

Comes from trees

Question 5

What are metal materials?

Answer 5

Comes from minerals extracted from mines

Question 6

What are plastic materials?

Answer 6

Obtained from petroleum & coal

Question 7

What are stone & ceramic materials?

Answer 7

Natural origin and are made of stone, sand & clay.

Question 8

What are textile materials?

Answer 8

Primarily obtained from raw materials (wool)

Question 9

What are material properties?

Answer 9

Charecteristics of a material

Question 10

What are the 3 types of material properties?

Answer 10

Technological, physical & chemical properties.

Question 11

What 4 types of technological are there?

Answer 11

Malleability, Fusibility, Ductility & Weldability.

Question 12

What’s malleability?

Answer 12

Flattened into sheets with pressure

Question 13

What’s fusibility?

Answer 13

Solid to liquid in certain temperatures

Question 14

What’s ductility?

Answer 14

Stretched to form threads

Question 15

What’s weldability?

Answer 15

to be welded (materials to be joined)

Question 16

What 4 types of physical properties are there?

Answer 16

Hardness, Toughness, Elasticity & Mechanical resistance.

Question 17

What’s density?

Answer 17

The amount of matter in a specific volume.

Question 18

How is density calculated?

Answer 18

D = mass (normally kg) / volume (normally m^3)

Question 19

What’s hardness?

Answer 19

resistance to being scratched or penetrated

Question 20

What’s toughness?

Answer 20

property that allows materials to be hit or struck (do not resist impacts are called fragile materials)

Question 21

What’s elasticity?

Answer 21

property of recovering shape after being deformed

Question 22

What’s mechanical resistance?

Answer 22

property of withstanding forces without deforming or breaking

Question 23

Which types of mechanical stress are there?

Answer 23

Tensile, Shear, compressive, flexural & torsion.

Question 24

What’s tensile stress?

Answer 24

subjected to pulling or stretching

Question 25

What’s shear stress?

Answer 25

subjected to cutting

Question 26

What’s compressive stress?

Answer 26

subjected to compressing

Question 27

What’s flexural stress?

Answer 27

subjected to bending

Question 28

What’s torsion stress?

Answer 28

subjected to twisting

Question 29

What types types of physical & chemical properties are there?

Answer 29

Thermal & electrical properties: Thermal conductivity, Thermal expansion, melting point & electrical conductivity.

Chemical properties: Oxidation & Corrosion.

Question 30

What’s thermal conductivity?

Answer 30

capacity to transmit heat

Question 31

What’s thermal expansion?

Answer 31

capacity of expanding volume when heated

Question 32

What’s melting point?

Answer 32

temperature which goes from solid to liquid

Question 33

What’s electrical conductivity?

Answer 33

capacity of having an electrical current

Question 34

What’s oxidation?

Answer 34

combined with oxygen, transforming it to oxide. Created oxide later when exposed of oxygen.

Question 35

What’s corrosion?

Answer 35

if oxidation takes place with water, it corrodes. Corrosion is more dangerous because it slowly destroys the material.