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Technology

Grade 7

Structures and communication

Module 20

Structures

Demonstrates knowledge and understanding of structures in terms of:

  • specific properties and use of material (e.g. water resistance, thermal insulation, fire resistance);
  • stability (e.g. base size, centre of gravity);
  • strengthening (e.g. corrugation, laminating, reinforcing);
  • joining techniques.

SPECIFIC PROPERTIES AND USE OF MATERIAL

Background

Structures are designed and built to stand up to certain loads or forces. The strength of a structure are determined by

  • the strength of the materials making up the structure;
  • the quality of the joints between the parts;
  • the shape of the parts;
  • the way the parts are arranged together.

THERMAL INSULATION is when materials like plastic is made strong so that they will be resistant to heat. Once formed into a shape they cannot be reshaped, because they show resistance to heat. Although they are quite hard, they can be chipped or cracked by being dropped or banged. Examples of such plastics are the bodies of some cars, some glues, work surfaces in some kitchens, the handles of saucepans, good quality electrical fittings like the fittings on light switches and some bowls, jars and glasses.

Assignment 1:

To find examples of structures

[lo 2.1]

Look for pictures of examples of structures that were formed by using thermal insulation and paste them on a sheet of paper.

Structures that have FIRE RESISTANCE, shows some resistance against heat. Structures that are WATER RESISTANT, show some resistance against water and can be easily submerged into water without getting wet or damaged.

Strengthening

Ways of strengthening structures are through:

  • CORRUGATION, like some cans and asbestos roofs;
  • LAMINATING, e.g. to cover placemats or pieces of wood with plastic.

LAMINATING; like the strengthening of placemats with plastic or to make permanently bent pieces of wood. Wood is often thought as a rigid material, because it will bend and usually springs back into shape when released. Because wood is ‘springy” it is not easy to make bent or curved shapes from straight pieces of wood, but by laminating wood you can bend it. Thin layers of wood are glued together. A thin layer of wood is easy to bend. Each layer has glue put on it and is bent into shape around a former. The whole shape is held in the former until the glue sets. Laminating can be used for small things like tennis rackets and chairs, or for large things like roof beams. Have you heard about laminated floors? How is it made?

Assessment

LO 2
TECHNOLOGICAL KNOWLEDGE AND UNDERSTANDING The learner will be able to undertsand and apply relevant technological knowledge ethically and responsibly.
Assessment standards (ASs)
We know this when the learner:
structures:
2.1 demonstrates knowledge and understanding of structures.
processing :2.2 demonstrates knowledge and understanding of how materials can be processed to change or improve properties (e.g. strength, fire resistance, waterproofing, taste, volume, texture).
We know this when the learner:
impact of Technology:
3.2 expresses some reasons why products of technology affect the quality of people’s lives positively and negatively.

Questions & Answers

what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Technology grade 7. OpenStax CNX. Sep 10, 2009 Download for free at http://cnx.org/content/col11032/1.1
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