1) Materials And Their Applications

Question 1

Mechanical properties

Answer 1

How a material reacts to an external force

Question 3

Compressive strength =

Answer 3

The ability to withstand being crushed or shortened by pushing forces

Question 4

Tensile strength =

Answer 4

The ability to resist Stretching or pulling forces

Question 5

Bending strength

Answer 5

The ability to resist forces that may bend the material

Question 6

Sheer strength

Answer 6

The ability to resist sliding forces on a parallel plane

Question 7

Torsional strength

Answer 7

The ability to withstand twisting forces from applied torque or torsion

Question 8

Hardness

Answer 8

The ability to resist abrasive wear such as scratching, surface indentation or cutting

Question 9

Toughness

Answer 9

The ability to absorb impact force without fracture

Question 10

Plasticity

Answer 10

The ability to be permanently deformed and retain the deformed shape

Question 11

Ductility

Answer 11

The ability to be drawn out under tension reducing the cross-sectional area without cracking for example stretching material into a wire

Question 12

Malleability

Answer 12

The ability to withstand defamation by compression without cracking. malleability increases with a rise in temperature

Question 13

Physical properties

Answer 13

Associated with the actual make up or structure of the material

Question 14

Density

Answer 14

The mass of the material in a standard volume of space

Question 15

Fusibility

Answer 15

The ability of the material to be fused or converted from a solid to a liquid state usually by heat

Question 16

Magnetism

Answer 16

The natural force between objects that causes the material to attract iron or steels

Question 17

Corrosion/degradation resistance

Answer 17

The ability of the material to withstand environmental attack and decay

Question 18

Electrical conductor

Answer 18

Allows the flow of electrical current through the material. The opposite is an electrical insulator

Question 19

Thermal conductor

Answer 19

Allows the transfer of heat energy food and material. The opposite is a thermal insulator

Question 20

Thermal expansion

Answer 20

The increase in material volume in response to heat input

Question 21

Opaque

Answer 21

Prevents light from travelling through

Question 22

Translucent

Answer 22

Allows light food but defuses to light so that objects appear blurred e.g. frosted glass

Question 23

Transparent

Answer 23

Allows light to pass through fully

Question 24

Elasticity

Answer 24

The ability to be deformed and then return to the original shape when the force is removed