Structures and Forces

Question 1

Define structures

Answer 1

A definite shape, and size which serve a purpose

Question 2

What are natural structures? Give examples

Answer 2

Structures that are not made by people. Examples: Plants, caves, and mountains

Question 3

What are man-made/ manufactured structures? Give examples

Answer 3

Structures made by people. Examples: The Great Wall of China, the Eiffel Tower, and the Burj Khalifa

Question 4

What are mass structures? Give examples

Answer 4

Solid structures which rely on their weight to resist loads. Examples: Pyramids, dams, and brick walls

Question 5

What are frame structures? Give examples

Answer 5

The “skeleton” of something made of strong materials. Examples: Houses, bridges, and even the human skeleton

Question 6

What are shell structures? Give examples

Answer 6

A structure with a curved shape that is hollow. Examples: Seashells, eggs, bubbles, and soda cans

Question 7

What are combination structures? Give examples

Answer 7

A mix of two or more structures. Examples: Football helmets, hydroelectric dams, and airplanes

Question 8

Pros of mass structures

Answer 8

Easy to build
Holds itself together
Durable

Question 9

Cons of mass structures

Answer 9

Takes lots of materials
Heavy
Hard to design

Question 10

Pros of shell structures

Answer 10

Hollow
Thin
Light

Question 11

Cons of shell structures

Answer 11

They need to be perfect
Hard to make

Question 12

Pros of frame structures

Answer 12

Easy to design
Easy to build
Cheap
Has space

Question 13

What is a con of frame structures

Answer 13

You need to consider forces

Question 14

What does function mean?

Answer 14

What it does

Question 15

What do aesthetics refer to

Answer 15

The beauty of a design

Question 16

What is the margin of safety?

Answer 16

Keeping things safe

Question 17

What are materials?

Answer 17

What objects are made of

Question 18

True or false: Materials should reflect the purpose of the structure?

Answer 18

True

Question 19

What are composite materials? What is an example?

Answer 19

Two or more materials that have different properties. Example: Reinforced concrete

Question 20

What are layered materials?

Answer 20

Layers of different or same material pressed and glued together

Question 21

What are woven and knit materials? Give an example

Answer 21

Things that are knit together to make strong flexible material. Example: Sweaters

Question 22

When engineers choose what materials to use when building structures, what 4 things must they consider?

Answer 22

Cost, Appearance, Environmental Impact, and Energy Efficiency

Question 23

True or false: Rigid joints don’t move but mobile joints do

Answer 23

True

Question 24

What are fasteners?

Answer 24

Devices that join or attach two or more objects together

Question 25

What do interlocking shapes do?

Answer 25

Attach parts by carefully shaping them to fit

Question 26

True or false: The rigid joint of tying things together is literally knotting two things

Answer 26

True

Question 27

What are adhesives used for?

Answer 27

They are used to glue any materials together

Question 28

What are examples of melting?

Answer 28

Welding and brazing

Question 29

What is mass?

Answer 29

The measure of the amount of matter in an object

Question 30

How do we measure mass?

Answer 30

In grams/kilograms

Question 31

What is the tool that measures mass called?

Answer 31

A balance scale

Question 32

What is weight?

Answer 32

The measure of the pull of gravity/how much force is applied

Question 33

What is the unit that weight is measured in?

Answer 33

Newtons

Question 34

What tool is used to measure weight?

Answer 34

A force meter/spring scale

Question 35

Which one changes depending on which planet you are on? Weight or mass?

Answer 35

Weight

Question 36

What is a force?

Answer 36

Any push or pull

Question 37

What is the diagram that shows force called?

Answer 37

The force diagram