<< Chapter < Page Chapter >> Page >

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

Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
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
hi
Loga
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get the best Algebra and trigonometry course in your pocket!





Source:  OpenStax, Technology grade 7. OpenStax CNX. Sep 10, 2009 Download for free at http://cnx.org/content/col11032/1.1
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Technology grade 7' conversation and receive update notifications?

Ask