Chapter 12 - Technical Engineering

Question 1

What is a component?

Answer 1

Is a part that performs a mechanical function

Question 2

What is linking?

Answer 2

The mechanical function performed by any component that connects different parts of a technical object

Question 3

What are the characteristics of links? /4(8)

Answer 3

Direct/ Indirect

Rigid/ Flexible

Removable/ Non-removable

Complete/ Partial

Question 4

What is a direct link?

Answer 4

When two parts hold together without a linking component

Ex. Tire and wheel of a bicycle

Question 5

What is an indirect link?

Answer 5

When the parts REQUIRE a linking component to hold them together.

Ex. Door and hinge (need a screw)

Question 6

What is a rigid link?

Answer 6

When the linking component or the surfaces of the linked parts can NOT be deformed

Ex. Knife blade and handle

Question 7

What is a flexible link? /2

Answer 7

When the linking component or surfaces of the linked parts can be deformed.

Can be subject to constraints

Ex. Springs, rubber

Question 8

What is a removable link? /2

Answer 8

Linked parts can be separated WITHOUT DAMAGE on either their surfaces or the link itself (if present)

Ex. Nails, screws, bolts (MUST BE PRESENT)

Question 9

What is a non-removable link?

Answer 9

Separating the linked parts DAMAGES their surface or the link (if present)

Ex. Brick wall (cement and brick will break if taken apart)

Question 10

What is a complete link?

Answer 10

Linked parts can NOT move independently of one another

Ex. Shovel

Question 11

What is a partial link?

Answer 11

AT LEAST ONE part can move independently of the other parts

Ex. Wheel of a skateboard

Question 12

What are the different types of constraints? /5

Answer 12

Compression
Tension
Torsion
Deflection
Shearing

Question 13

What is a constraint?

Answer 13

Describes the effect of external forces in a material

Question 14

What kind of constraint is compression?

Answer 14

Subjected to forces that tend crush

Ex. Crushing a can

Question 15

What kind of constraint is tension?

Answer 15

Subjected to forces that tend to stretch

Ex. Copper stretched into a wire

Question 16

What kind of constraint is torsion?

Answer 16

Subjected to a force that tends to twist

Ex. Wringing a wet towel

Question 17

What kind of constraint is deflection?

Answer 17

Subjected to forces that tend to bend

Ex. Clothes weighing a clothes line

Question 18

What kind of constraint is shearing?

Answer 18

Subjected to forces that tend to cut

Ex. Scissors cutting paper

Question 19

What is deformation?

Answer 19

Extended forces on materials and that have a tendency to deform them

Question 20

What are different types of deformation?

Answer 20

Elastic
Plastic
Fracture

Question 21

What kind of deformation is elastic? /2

Answer 21

Temporary change in shape or dimensions of the material

When the constraint applied is removed, the material returns to its original form

Ex. Spring, sponge

Question 22

What kind of deformation is plastic? /2

Answer 22

Permanent change in the shape or dimensions of the material

Even when the constraint is removed, the material stays deformed

Ex. Scrunching of paper

Question 23

What kind of deformation is fracture?

Answer 23

The constraint is so intense that the material BREAKS

Ex. Glass

Question 24

What is degradation of a material?

Answer 24

The decline in some of its properties due to the effects of the surrounding environment

Question 25

What is the protection of a material?

Answer 25

The application of procedures that prevent or delay it’s degradation

Question 26

What are mechanical properties of materials?

Answer 26

Describes how material reacts when subjected to constraints

Question 27

What are the different properties of materials? /7

Answer 27

``` Hardness Elasticity Resilience Stiffness Toughness Ductility Malleability ```

Question 28

What kind of property is hardness? /3

Answer 28

Ability to resist indentation or abrasion (dents and scratches) High: concrete, diamonds Low: wax, play-doh

Question 29

What kind of property is elasticity? /3

Answer 29

Ability to return to its original shape after undergoing a constraint High: skin, elastic, balloon Low: most things that are not rubber (to an extent)

Question 30

What kind of property is resilience?

Answer 30

Ability to resist shocks without breaking High: car bumper Low: glass

Question 31

What kind of property is stiffness?

Answer 31

Ability to retain its shape when subject to constraints

Question 32

What kind of property is toughness?

Answer 32

Ability to absorb energy Ex. Black panther‘s suit

Question 33

What kind of property is ductility? /4

Answer 33

Ability to be stretched without breaking Shape materials Manufacturing materials Do not describe the function of metals

Question 34

What are other properties of metals? /6

Answer 34

Chemical neutrality Resistance to corrosion Electrical conductivity Heat resistance Thermal conductivity Lightness

Question 35

What kind of property is chemical neutrality?

Answer 35

The material does NOT react with other substances Ex. Science desks

Question 36

What kind of property is resistance to corrosion?

Answer 36

Ability to resist the effects of corrosive substances which cause the formation of rust Ex. Hubcaps protect tires

Question 37

What kind of property is electrical conductivity?

Answer 37

Ability to carry an electric current Ex. Metals, wires

Question 38

What kind of property is heat resistance?

Answer 38

Ability to resist heat Ex. Ceramics

Question 39

What kind of property is thermal conductivity?

Answer 39

Ability to transmit false

Question 40

What kind of property is lightness?

Answer 40

Not heavy, nor dense