# 1.1 Forces and structures

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## Forces and structures

Activity 1

Forces and Structures

• Structures sag or give way when they are not strong enough to resist the forces that are brought to bear on them. If you are sitting on a chair, the force that you exert on that chair is static . If you rock to and fro while you are on the chair, the force is in motion and we speak of dynamic force . Static Force Dynamic Force
• We identify the following forces:

Stress

Compression

Flexure

Shearing

Assignment 1

1. You need to support your pencil case above the surface of your desk. The only thing that you have to help do this, is an A4 sheet of paper. Fold the paper in such a manner that you create a structure strong enough to act as support.
1. Place two space cases 250 mm apart. Use one A4 sheet of paper to create the strongest bridge possible by means of folding to span the gap between the space cases. Test the various bridges with a variety of weights to determine which is the strongest.

 LO 1.3

## Assessment

 Learning Outcomes(LOs) LO 1 TECHNOLOGICAL PROCESSES AND SKILLS The learner will be able to apply technological processes and skills ethically and responsibly using appropriate information and communication technology. This is demonstrated when the learner: investigates:1.1 investigates the background context, the nature of the need, the environmental situation, and the people concerned when given a problem, need or opportunity set in a nationally relevant context; 1.3 develops and performs practical tests in the technological areas (Structures, Processing, and Systems and Control); 1.4 uses appropriate technologies and methods to: collect relevant data from different sources and resources; extract relevant data; make meaningful summaries;use information to justify and support decisions and ideas; designs:1.5 writes or communicates a short and clear statement or a design brief in response to a given identified situation for the development of a product or system; 1.6 lists product and design specifications and constraints for a solution to an identified or given problem, need or opportunity based on most of the design key words listed below: people: age target market; purpose: function; appearance: colour, shape; environment: where will product be used; safety: for users; cost: cost of materials; 1.7 generates several alternative solutions and writes notes, ideas that show some links to the design brief and specifications; makes:1.9 develops a plan for making that outlines all of the following: resources needed; sketches showing the necessary dimensions or quantities; all steps necessary to making the product;

## Memorandum

ACTIVITY 1

• Encourage the learners to illustrate the four types of force by means of additional examples.

Assignment 1

1. Let the learners offer other ideas and discuss each idea (e.g. will a rectangular 'pillar' be stronger or weaker? Will a slender double-walled pillar (with the paper overlapping) be stronger than a more stocky pillar with single-layer walls?)
2. Let the learners decide which factors determine strength: e.g. more shallow folds or fewer deeper folds, the type of paper, etc.
• Allow sufficient time for learners to name examples from their daily environment. The class could discuss the examples and suggest improvements.

#### Questions & Answers

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
what is biological synthesis of nanoparticles
Sanket Reply
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Source:  OpenStax, Technology grade 8. OpenStax CNX. Sep 13, 2009 Download for free at http://cnx.org/content/col11052/1.1
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