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Natuurwetenskappe

Graad 4

Die planeet aarde en die heelal

Module 43

Weerpraatjies

Aktiwiteit:

Om oor die weer te praat

[lu 1.3, 2.1]

Die een ding op aarde wat elke dag die meeste verander, is sekerlik die weer. Die weer beïnvloed waar ons wil woon, die klere wat ons dra en die aktiwiteite wat ons beplan.

Die mens is nou maar eenmaal so: ons wil altyd weet wat die weer gaan doen. Daarom hou ons die weervoorspellings op televisie en in die koerante dop en luister gereeld na die radio.

Noem gou ‘n paar redes in jou groep op waarom dit nodig mag wees om vooruit te weet wat die weer inhou.

Wat is weer nou eintlik?

Hitte en sonlig beweeg deur die aarde se atmosfeer. Die sonstrale beïnvloed die lug op vier maniere, nl. die temperatuur, humiditeit, lugdruk en die wind.

Skryf ‘n sinnetjie oor elk van bogenoemde. Kyk na die beskrywende prentjies:

Temperatuur

Humiditeit

Lugdruk

Wind

Probeer die volgende

Maak ‘n vlaggie en hang dit buite in ‘n oopte om te kyk hoe sterk die wind daardie dag waai.

Hang lepeltjies aan vislyn aan ‘n draadhanger buite op. Luister hoe die wind waai!

Assessering

Leeruitkoms 1: wetenskaplike ondersoek

Die leerder is in staat om met selfvertroue op weetgierigheid oor natuurlike verskynsels te reageer, en om binne die konteks van wetenskap, tegnologie en die omgewing verbande te ondersoek en probleme op te los.

Assesseringstandaard

Dis duidelik wanneer die leerder

  • data evalueer en bevindinge kommunikeer.

LEERUITKOMS 2: KONSTRUKSIE VAN WETENSKAPKENNIS Die leerder ken, interpreteer en pas wetenskaplike, tegnologiese en omgewingskennis toe.

Assesseringstandaard

Dis duidelik wanneer die leerder

  • betekenisvolle inligting onthou.

Memorandum

  • Noem gou ‘n paar redes in jou groep op waarom dit nodig mag wees om vooruit te weet wat die weer inhou.

Moontlike redes

  • As jy uitgaan, wil jy weet of jy ‘n jas of dalk ‘n reënbaadjie moet saamneem, veral na sportwedstryde of buitelugoptredes.
  • Boere beplan hulle take volgens die weer.
  • Indien daar dalk gevaar (bv. orkaan of ‘n tornado) is, moet veiligheidsmaatreëls reeds is plek wees.
  • Ons wil sien of ons ons wasgoed maar buite kan hang!

Temperatuur: Die son verwarm die aarde. Die hitte reflekteer vanaf die wolke en vanaf die aarde om die temperatuur van die lug te bepaal.

Humiditeit: Waterdamp styg op vanaf die aarde en die see om wolke te vorm. Wanneer daar baie waterdruppels bymekaar is, val die reën na die aarde. Humiditeit is die voggehalte van die lug.

Lugdruk: Lugdruk word bepaal deur die lug wat in verskillende rigtings gedruk word.

Wind: Wind is lug wat vinnig beweeg.

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 4. OpenStax CNX. Sep 18, 2009 Download for free at http://cnx.org/content/col11097/1.1
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