STRUCTURES

Question 1

What is a structure?

Answer 1

Something that is BUILT, MADE or PUT TOGETHER in a particular way.

It can be STIFF, STABLE and STRONG and can SUPPORT loads.

Question 2

Name types of Structures.

Answer 2

1. Shell Structure
2. Frame Structure
3. Solid Structure

Question 3

Discuss Shell Structure:

Answer 3

• Most containers (that hold something) are shell structures
• They are usually lighter that frame structures
• Strength of shell is on outside, eg. bag for rice, coffe mug

Question 4

Explain Frame Structure

Answer 4

Is different parts joined together by joints.

Build in such a way that it makes the structure strong

Question 5

What is a Solid Structure?

Answer 5

They do not have different parts with open spaces, like roks, bricks, cement poles

Question 6

What are the purpose of a structure?

Give 2 examples at each purpose

Answer 6

1. Contain - enclose or hold something
2. Protect - shield or cover
3. Support - hold or strengthen something
4. Span a distance - arch spanning between pillars

Question 7

How do we classify structures and explain/discuss with an example

Answer 7

Natural Structures:

Not made by people eg. caves, skeletons

Man-made Structures:

Made in workshops or factories eg. planes, tables, chairs

Question 8

Name the following forces on Structures:

Answer 8

COMPRESSION:

A squashing force that compresses a structure

Question 9

Name the following forces on structures:

Answer 9

TENSION:

A strecthing force on a structure

Question 10

Name the following force on a tructure and explain:

Answer 10

TORSION:

A twisting force on a structure

Question 11

What force is this and explain:

Answer 11

BENDING:

A bending force on s structure

Question 12

Name this force on a structure and explain.

Answer 12

SHEARING:

Its a tearing force

Question 13

Why do we need to strenghten structures?

Answer 13

There are always forces pushing (compression) and pulling (tension) on structures and they need to be able to withstand this

Question 14

What is a push force?

Answer 14

A force used in the direction of the object - push

This power causes pressure

Question 15

What is a pull force?

Answer 15

A force used away from the object - pulling

The power causes tension

Question 16

How can we strengthen MATERIALS ? Discuss

Answer 16

Tubing / Struts:

• Has 3 shapes - Triangular, round, square
• Round tubing carry most weight - strongest
• Tubing can be used as a pillar to carry weight of building or bridge

Folding:

• Folding - by folding something it becomes thicker and stronger eg. corrugated paper (boxes) or corrugated iron (roofs)

Question 17

How can we strengthen STRUCTURES?

Answer 17

By using or joining triangular shapes to strengthen structures, like:

• Struts
• Braces and Gussets

Question 18

What is this and how does it work?

Answer 18

STRUTS:

A traingular is stronger than a square. Struts are used to strengthen the pole in a fence against the push and pull forces

Question 19

What is this and how do we use this?

Answer 19

BRACES OR GUSSETS:

Small triangular shapes placed in corners of squares to strenghten a structure.

And so that the shape cannot change