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Natuurwetenskappe

Graad 5

Energie en verandering

Module 31

Vorms van energie

Aktiwiteit 1:

Om tussen verskillende vorms van energie te kan onderskei

[lu 2.1]

  • Jy het reeds in graad 4 bewus geword van die belangrikste bron van energie, naamlik die son.

Die energie van die son bereik ons in die vorm van bestraling, lig en hitte.

Kom ons kyk nou in watter ander vorms energie voorkom.

Energie in gestoorde vorm

Die energie van die son is deur die plant opgeneem en in voedsel gestoor. Energie kom dus in gestoorde vorm in voedsel voor. Diere en mense eet die plant as voedsel en gebruik die energie. Plante wat miljoene jare gelede nie deur diere gevreet is nie, het weens bepaalde omstandighede in steenkool verander. Gestoorde energie kom dus ook in steenkool en olie voor.

Energie word ook in elektriese selle (batterye) gestoor. Wanneer die sel aan 'n gloeilampie gekoppel word, word die energie vrygestel.

Bewegingsenergie

Energie kan gebruik word om beweging te laat plaasvind, byvoorbeeld 'n mens wat hardloop, 'n wiel wat rol of 'n enjin wat loop. Ons kan ook van meganiese energie praat.

Klankenergie

Klank bereik jou oor in die vorm van golwe in die lug. Die golwe laat jou oordrom vibreer en jou brein neem die vibrasie waar as klank. Ons kan van die energie wat die vibrasie veroorsaak, praat as klankenergie.

Elektriese energie

'n Elektriese stroom is 'n hoeveelheid energie wat van een punt na 'n ander vloei en die sterkte van die stroom (hoeveelheid energie) word in ampères (A) gemeet.

Atoomenergie

Jy het beslis al van kernkrag en kernkragsentrales gehoor. Kernkrag verwys na die energie wat in atome voorkom. Atome is die kleinste deeltjies waaruit 'n stof opgebou is. 'n Stof is iets wat sigbaar is of iets wat massa het en geweeg kan word, byvoorbeeld goud, water en koper. Het jy al gehoor van uraan?

Die omskakeling van energie van een vorm na 'n ander

Jy het nou iets geleer oor verskillende vorms waarin energie voorkom. Dink jy energie wat in 'n bepaalde vorm voorkom, kan na 'n ander vorm omgeskakel word? Gebruik twee van die voorbeelde wat ons gebruik het om hierdie vraag te beantwoord.

Assessering

LU 2

KONSTRUKSIE VAN WETENSKAPKENNIS Die leerder ken, interpreteer en pas wetenskaplike, tegnologiese en omgewingskennis toe.

Dit is duidelik wanneer die leerder:

  • betekenisvolle inligting onthou: ten minste eie vlotste taal gebruik om voorwerpe, materiaal en organismes te noem en te beskryf.

Memorandum

Omskakeling van energie: Ja. Daar is baie voorbeelde, bv.

Sonligenergie wat deur plante gebruik word vir voedsel. Dus hitte-/lig-/stralingsenergie omgeskakel na gestoorde energie;

Energie in gestoorde vorm kan na enige ander vorm omgeskakel word;

Elektriese energie word omgeskakel na lig-/warmte-energie;

Elektriese energie kan omgeskakel word na klankenergie;

Atoomenergie kan na elektriese energie omgeskakel word.

Questions & Answers

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
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
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Natuurwetenskappe graad 5. OpenStax CNX. Sep 23, 2009 Download for free at http://cnx.org/content/col10980/1.2
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