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Natural science

Grade 4

Energy and change

Module 25

The meaning of the word ‘energy’

Energy and change

What is the meaning of the word energy? If we consult a dictionary, it is defined as the power to operate or act or the capacity of a body or system to do work .

Activity:

To understand the meaning of the word “energy”

[lo 2.1]

The illustration below shows the manner in which we live nowadays. Discuss what you see and identify all examples of energy being used.

E

N

E

R

G

Y

Energy is the special power of your body to do work. If you work hard, you use much energy and need more. Sometimes you might not feel like getting out of bed in the morning, but at other times, you may feel that you have enough energy to climb a mountain.

Anything that works, even a machine, needs energy. People definitely need energy, even if it is to just stay alive.

There are many sources of energy in nature that can be used to do our work for us, but we need to realise that we will not have these sources forever. We therefore have to learn to use them with care. Many of the people in our country also do not have access to these sources of energy. Those of us who do have this should learn to regard it as a privilege and not as a right.

Assessment

LEARNING OUTCOME 2: CONSTRUCTING SCIENCE KNOWLEDGE

The learner will know and be able to interpret and apply scientific, technological and environmental knowledge.

Assessment Standard

We know this when the learner

2.1 recalls significant information.

Memorandum

THE MEANING OF THE WORD “ENERGY”

  • Have a lively discussion about the picture. Let the learners discuss it in groups first and then let them give feedback to the rest of the class. Then talk about energy in general. Refer to the picture while the module is being done.
  • First of all, before the assignment is done, have a general discussion on energy.
  • Any acceptable answer is correct.

Energy is life.

Nothing can exist without energy.

In order to work, I need energy.

Ready for the day!

Enough get-up-and-go for the day.

Something I can do.

I need energy to participate in sport.

Questions & Answers

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
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
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
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
how to synthesize TiO2 nanoparticles by chemical methods
Zubear
what's the program
Jordan
?
Jordan
what chemical
Jordan
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Berger describes sociologists as concerned with
Mueller Reply
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Source:  OpenStax, Natural sciences grade 4. OpenStax CNX. Sep 18, 2009 Download for free at http://cnx.org/content/col11096/1.1
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