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3.7 Weervoorspelling

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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:

______________________________________________________

_______________________________________________

_______________________________________________

_______________________________________________

_______________________________________________

_______________________________________________

_______________________________________________

________________________________________________

__________________________________________________

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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

Three charges q_{1}=+3\mu C, q_{2}=+6\mu C and q_{3}=+8\mu C are located at (2,0)m (0,0)m and (0,3) coordinates respectively. Find the magnitude and direction acted upon q_{2} by the two other charges.Draw the correct graphical illustration of the problem above showing the direction of all forces.
Kate Reply
To solve this problem, we need to first find the net force acting on charge q_{2}. The magnitude of the force exerted by q_{1} on q_{2} is given by F=\frac{kq_{1}q_{2}}{r^{2}} where k is the Coulomb constant, q_{1} and q_{2} are the charges of the particles, and r is the distance between them.
Muhammed
What is the direction and net electric force on q_{1}= 5µC located at (0,4)r due to charges q_{2}=7mu located at (0,0)m and q_{3}=3\mu C located at (4,0)m?
Kate Reply
what is the change in momentum of a body?
Eunice Reply
what is a capacitor?
Raymond Reply
Capacitor is a separation of opposite charges using an insulator of very small dimension between them. Capacitor is used for allowing an AC (alternating current) to pass while a DC (direct current) is blocked.
Gautam
A motor travelling at 72km/m on sighting a stop sign applying the breaks such that under constant deaccelerate in the meters of 50 metres what is the magnitude of the accelerate
Maria Reply
please solve
Sharon
8m/s²
Aishat
What is Thermodynamics
Muordit
velocity can be 72 km/h in question. 72 km/h=20 m/s, v^2=2.a.x , 20^2=2.a.50, a=4 m/s^2.
Mehmet
A boat travels due east at a speed of 40meter per seconds across a river flowing due south at 30meter per seconds. what is the resultant speed of the boat
Saheed Reply
50 m/s due south east
Someone
which has a higher temperature, 1cup of boiling water or 1teapot of boiling water which can transfer more heat 1cup of boiling water or 1 teapot of boiling water explain your . answer
Ramon Reply
I believe temperature being an intensive property does not change for any amount of boiling water whereas heat being an extensive property changes with amount/size of the system.
Someone
Scratch that
Someone
temperature for any amount of water to boil at ntp is 100⁰C (it is a state function and and intensive property) and it depends both will give same amount of heat because the surface available for heat transfer is greater in case of the kettle as well as the heat stored in it but if you talk.....
Someone
about the amount of heat stored in the system then in that case since the mass of water in the kettle is greater so more energy is required to raise the temperature b/c more molecules of water are present in the kettle
Someone
definitely of physics
Haryormhidey Reply
how many start and codon
Esrael Reply
what is field
Felix Reply
physics, biology and chemistry this is my Field
ALIYU
field is a region of space under the influence of some physical properties
Collete
what is ogarnic chemistry
WISDOM Reply
determine the slope giving that 3y+ 2x-14=0
WISDOM
Another formula for Acceleration
Belty Reply
a=v/t. a=f/m a
IHUMA
innocent
Adah
pratica A on solution of hydro chloric acid,B is a solution containing 0.5000 mole ofsodium chlorid per dm³,put A in the burret and titrate 20.00 or 25.00cm³ portion of B using melting orange as the indicator. record the deside of your burret tabulate the burret reading and calculate the average volume of acid used?
Nassze Reply
how do lnternal energy measures
Esrael
Two bodies attract each other electrically. Do they both have to be charged? Answer the same question if the bodies repel one another.
JALLAH Reply
No. According to Isac Newtons law. this two bodies maybe you and the wall beside you. Attracting depends on the mass och each body and distance between them.
Dlovan
Are you really asking if two bodies have to be charged to be influenced by Coulombs Law?
Robert
like charges repel while unlike charges atttact
Raymond
What is specific heat capacity
Destiny Reply
Specific heat capacity is a measure of the amount of energy required to raise the temperature of a substance by one degree Celsius (or Kelvin). It is measured in Joules per kilogram per degree Celsius (J/kg°C).
AI-Robot
specific heat capacity is the amount of energy needed to raise the temperature of a substance by one degree Celsius or kelvin
ROKEEB
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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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