Science chapter 11 quiz

Question 1

Stability:

Answer 1

The ability of a structure to remain or return stable

Question 2

Centre of gravity:

Answer 2

The point around in which an object’s mass is equally balanced in all directions

Question 3

Beam:

Answer 3

Horizontal structure designed to support a load

Question 4

I-beam:

Answer 4

A beam that i shaped in the letter I when seen from an angle

Question 5

Corrugation:

Answer 5

Multiple folds in a material that provides extra strength

Question 6

Cantilever:

Answer 6

A beam supported only on one end

Question 7

Truss:

Answer 7

A network of beams arranged in triangles

Question 8

Arch:

Answer 8

A curved structure used to span a space while supporting a load

Question 9

Dome

Answer 9

: A shell structure that looks like a sphere split in half

Question 10

Tension

Answer 10

Internal pulling of the particles in an object

Question 11

Dome

Answer 11

A shell structure that looks like a sphere split in half

Question 12

Structural failure

Answer 12

A result of a structure losing its ability to support a load.

Question 13

Bad design

Answer 13

faulty construction, extraordinary loads, foundation failure.

Question 14

Compression

Answer 14

An internal force that presses the particles of an object together

Question 15

Wood Vs Steel

Answer 15

Steel is stronger than wood but heavier, wood is lighter but weaker

Question 16

How to increase stability?

Answer 16

You can add support to beams in many different ways. Some include, Rebars, struts, gusset, and tie. Another way is to use stronger material, stronger design like an I-beam, and lastly congregation.

Question 17

Structural failure:

Answer 17

A result of a structure losing its ability to support a load

Question 18

Rebar:

Answer 18

Steel reinforced bars put into concrete to help beams with compression and tension, while strengthening concrete

Question 19

Compression:

Answer 19

An internal force that presses the particles of an object together.:

Question 20

Tension;

Answer 20

Internal pulling of the particles in an object

Question 21

Wood Vs Steel:

Answer 21

Steel is stronger than wood but heavier, wood is lighter but weaker

Question 22

How to increase stability?

Answer 22

the lowest the center of gravity, the more difficult it is to make a structure topple over, therefore the more stable is the structure.

Question 23

What are the differences between a simple beam and a cantilever?

Answer 23

A beam is a flat structure supported at both ends; a cantilever is a beam that is supported at only one end. A Beam could be the upper part of a door or tabletop. A Cantilever can be a gorge or canopies.

Question 24

why are trusses so useful?

Answer 24

Trusses are useful because they provide strength with minimal mass. Some examples are construction cranes, hydro towers, and bridges.

Question 25

why is regular maintenance safety important?

Answer 25

Regular maintenance for safety is important because materials used in structures may degrade over time, which reduces the ability to support loads. The structure subjected to an extraordinary load that damaged or weakened the structure. Some bridges are inspected for cracks for safety.

Question 26

human factors are the cause of structural failure?

Answer 26

The most common failures are due to bad design, faulty construction, extraordinary loads, and foundation failure. Even failures that have not been caused directly by human actions could have been prevented if people considered extreme precautions.

Question 27

a student leans back on the chair, how does the centre of gravity work?

Answer 27

As the student leaned back in the chair, the student’s centre of gravity shifted back aswell. To have stability, the centre of gravity of an object must be over the object’s support base. In this case the base is the area between the legs of the chair. When the centre of gravity moved outside the support base, the force of gravity pulled down

Question 28

arches vs spheres

Answer 28

Arches: Used for entrance type spaces, downward force acting one plane of application In common: Curved at the top, compression force down Sphere: Used over wide spaces, downward force along many planes

Question 29

three factors that help support a load

Answer 29

The structure’s mass, shape and form can affect the structure’s stability. A truss bridge, for example, has very high strength with minimal mass, while a cantilever provides less support with more mass. Some examples of structural failure are: noncorrugated cardboard for boxes which would cause damage. Thin beams which would be crushed under weight.

Question 30

is corrugation a series of connected arches?

Answer 30

Corrugation is just a series of connected arches, is agreeable because each segment is rounded and has a downward force.

Question 31

basic shapes of the eiffel tower

Answer 31

The basic form of the Eiffel tower are triangles, different trusses, and arches.

Question 32

why do subway stations have arches

Answer 32

Subways have an arch shaped roof are because the arch supports heavy loads, and the arch provides a wide opening with compression extending outward in a downward force.

Question 33

why is rebar important?

Answer 33

Rebar is common because concrete can withstand compression but not tension and rebar helps resist tension.