# What is a system?

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## Systems

PRIOR KNOWLEDGE

1. WHAT IS A SYSTEM?
1. Gosh! Have you ever heard this word?

If your answer was yes , explain it briefly in writing. If your answer was no , have a careful look at the following:

Do you know that your body consists of nine different systems? Three of them are the skeleton , the muscle system and the respiratory system .

Assignment

1. Now write down the name of each system to correspond with the right picture below.
1. Can you name any of the other systems in your body?

A system is therefore a set of units that work together to perform a certain task.

Example: your skeleton consists of your skull (a unit) and all the other bones in your body (also a unit) that form a strong framework (task) for your body.

1. SYSTEMS IN TECHNOLOGY

In technology we find four systems, namely the electrical , mechanical , hydraulic (fluid pressure) and pneumatic (air pressure) systems.

1. MECHANICAL SYSTEMS

In this module we look at mechanical systems. An example of a big mechanical system is a bicycle. A mechanical system uses energy to carry out a specific function. This can be to change the speed, the direction or the force applied.

Assignment

Study the illustration with labels and answer the questions that follow:

1. What part/parts of the bicycle forms/form the following? (Copy the table on a sheet of paper or in your workbook and then fill in the open spaces.)
 Part / Parts Function a) propulsion unit? b) steering unit? c) stopping unit?
1. What is the function of each of the above?

[LO 1.2]

If we “break up” the bicycle into different parts according to the task that each one carries out, it is easier to understand how each unit works. Each unit can also be broken up into smaller systems, namely an input , a processing and an output unit.

1. CONTROL

Assignment

1. What does it mean to exercise control? (Use the explanatory dictionary.)

Control can be exercised by means of an open or a closed system. An open system can be controlled, while a closed system works automatically. (You will learn more about this in the higher grades.)

1. TYPES OF MECHANICAL SYSTEMS OR MECHANISMS

Examples of mechanical systems are depicted in the pictures below, and next to each is the name of the type of mechanical system.

1. TYPES OF MOVEMENT THAT A MECHANISM CAN PERFORM

There are mainly four types of movement that a mechanical system can perform if a force is applied to it:

a linear movement (in a straight line and in one direction).

a to-and-fro movement (forwards and backwards in a straight line).

a rotating movement (movement in a circle, like a wheel turning).

a swing movement (a forwards and backwards movement in an arch like a swing).

Assignment

1. Draw an arrow in the first column of the table to indicate the type of movement each of the mechanical systems carries out.

A machine is a combination of different mechanisms/mechanical systems.

[LO 1.3]

1. MOVEMENT

The earth’s gravitation causes all objects to be attracted to the earth. However, people have designed mechanical systems to allow machines to move in different directions and at different speeds. Wheels, levers, pulleys and gears make it easier to make a heavy object move.

## Assessment

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 technologies.

We know this when the learner:

Investigates:

1.2 finds out about existing products relevant to a problem, need or opportunity, and identifies some design aspects (e.g. who it is for, what it looks like, what it is for, what it is made of);

• performs, where appropriate, scientific investigations about concepts relevant to a problem, need or opportunity using science process skills:

1.3.1 planning investigations;

• conducting investigations;

1.3.3 processing and interpreting data;

1.3.4 evaluating and communicating findings.

Makes:

1.7 outlines a plan that shows the steps for making, including drawings or sketches of main parts;

1.8 uses suitable tools and materials to make products by measuring out, cutting or separating, shaping or forming, joining or combining, and finishing the chosen material;

Evaluates:

1.10 evaluates, with assistance, the product according to the design brief and given specifications and constraints (e.g. people, purpose, environment), and suggests improvements and modifications if necessary;

1.11 evaluates the plan of action followed and suggests improvements and modifications if necessary;

Communicates:

• produces labelled two-dimensional drawings enhanced with colour where appropriate.

LO 2

TECHNOLOGICAL KNOWLEDGE AND UNDERSTANDING

The learner will be able to understand and apply relevant technological knowledge ethically and responsibly.

We know this when the learner:

Systems and control:

• demonstrates knowledge and understanding of how to use energy sources to power mechanical systems in order to make a product move in some way.

## Memorandum

(a)

2. respiratory system skeletal system muscular system

3. nervous system digestive system glandular system

nervous system

e) electrical f) mechanical

(c) Parts Function

1. a) pedals, chain; wheels motion

b) handles; voorwiel change of direction

c) brakes stop

(d)

Is there any normative that regulates the use of silver nanoparticles?
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
why we need to study biomolecules, molecular biology in nanotechnology?
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
why?
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?
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
what does nano mean?
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?
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
it is a goid question and i want to know the answer as well
Maciej
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
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
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
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?
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 ?
for screen printed electrodes ?
SUYASH
What is lattice structure?
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
how did you get the value of 2000N.What calculations are needed to arrive at it
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