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Natuurwetenskappe

Graad 4

Die planeet aarde en die heelal

Module 44

Weervoorspelling

Aktiwiteit:

Om oor weervoorspelling te praat

[lu 3.1]

Maar waar kry die weervoorspellers hulle inligting?

Hulle moet inligting kry. Dit kom van weersatelliete, weerballonne en aardstasies. Metsat is die naam van so ‘n weersatelliet wat om die aarde wentel.

Daar is natuurlik ‘n kamera in die Metsat wat foto’s neem van die aarde wat die wolke wys en sneeu en storms wat aan die kom is, aantoon. Dit kan ook warm of koue plekke op die aarde aandui.

Inligting word versamel van die temperatuur, humiditeit (dit is die vog in die lug), windspoed- en rigting, wolktipes, lugdruk en reënval. Al hierdie inligting gaan nou na die weerstasie toe waar mense die inligting in ‘n rekenaar invoer om te verwerk.

Nou word ‘n weerkaart geteken wat ons op televisie en in die media sien.

Wie van julle wil probeer om ‘n weervoorspelling oor vandag se weer aan die klas te gee net soos op televisie gedoen word?

Probeer om elke dag ‘n kaart uit die koerant te knip en te bestudeer. Kyk mooi na die sleutel wat die verskillende soorte weer op die kaart aandui.

Hieronder is vir jou ‘n voorbeeld:

Bestudeer die sleutel en skryf die korrekte benamings vir die tekens neer:

______________________________________________________

_______________________________________________

_______________________________________________

_______________________________________________

_______________________________________________

_______________________________________________

_______________________________________________

________________________________________________

__________________________________________________

________________________________________________

Teken ‘n prentjie van jou gunsteling weer.

SON

REëN

BEWOLK

Hou nou jou eie weerkaart vir een week. Teken ‘n sonnetjie, reën of wolkie in die tweede kolom van jou tabel van vier kolomme en vul daarnaas die windspoed en temperatuur van elke dag ook in.

Kolom 1: Dag

Kolom 2: Weer

Kolom 3: Windspoed

Kolom 4: Temperatuur

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.

Assesseringstandaarde

Dis duidelik wanneer die leerder

1.1 ondersoek beplan;

1.2 ondersoek uitvoer en data versamel;

1.3 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

2.1 betekenisvolle inligting onthou.

LEERUITKOMS 3: WETENSKAP, DIE SAMELEWING EN DIE OMGEWING Die leerder is in staat om begrip van die onderlinge verband tussen wetenskap en tegnologie, die samelewing en die omgewing te toon.

Assesseringstandaard

Dis duidelik wanneer die leerder

3.1 wetenskap en tegnologie in die konteks van geskiedenis en inheemse kennis verstaan.

Memorandum

Mnr. Breinsel:

  • Wat is die regte woord vir ‘n weervoorspeller?Antwoord:
  • meteoroloog

Bestudeer die sleutel en skryf die korrekte benamings neer: sien sleutel op kaart.

Mnr. Breinsel:

  • Vind uit wat die volgende beteken:
  • ‘n hoogdruk
  • ‘n laagdruk
  • ‘n front

Hoogdruk: wanneer daar ‘n hoogdrukstelsel oor die land beweeg, beteken dit gewoonlik dat dit ‘n mooi dag gaan wees. Koue lug beweeg uit- en afwaarts en word warmer.

Laagdruk: ‘n laagdrukstelsel bring gewoonlik reën en bewolkte toestande. Koue lug beweeg in- en opwaarts en word koud.

Front: ons sien dikwels ‘n front na die land beweeg. Dit is maar net die rigting waarin warm of koue lug beweeg.

Questions & Answers

can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
ninjadapaul
20/(×-6^2)
Salomon
okay, so you have 6 raised to the power of 2. what is that part of your answer
ninjadapaul
I don't understand what the A with approx sign and the boxed x mean
ninjadapaul
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
Salomon
I'm not sure why it wrote it the other way
Salomon
I got X =-6
Salomon
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
ninjadapaul
oops. ignore that.
ninjadapaul
so you not have an equal sign anywhere in the original equation?
ninjadapaul
Commplementary angles
Idrissa Reply
hello
Sherica
im all ears I need to learn
Sherica
right! what he said ⤴⤴⤴
Tamia
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
Kim
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Al
y=10×
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
is it 3×y ?
Joan Reply
J, combine like terms 7x-4y
Bridget Reply
im not good at math so would this help me
Rachael Reply
yes
Asali
I'm not good at math so would you help me
Samantha
what is the problem that i will help you to self with?
Asali
how do you translate this in Algebraic Expressions
linda Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris 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
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
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
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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