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Natuurwetenskappe

Graad 4

Die planeet aarde en die heelal

Module 45

Stormagtige weer

Aktiwiteit:

Om van stormagtige weertoestande te leer

[lu 2.1, 3.1]

STORMAGTIGE WEER

Wat maak jy as die weer stormagtig is? Vertel die klas van snaakse stories.

Donker wolke pak in die lug saam. Swaar reën val op die aarde en nou en dan flits helder weerlig en jy hoor die harde donderweer. Maar hoe gebeur dit?

Wolke:

Die lug is vol klein stofdeeltjies. Waterdruppeltjies vorm rondom ‘n stofdeeltjie en dan vorm miljoene van hulle wolke. Donderwolke is die grootste wolke en kan tot 18 km van bo tot onder wees.

Probeer die volgende:

Merk ‘n leë fles in mm af en sit dit buite neer wanneer dit reën.

Weerlig:

Gedurende die storm waai sterk winde die klein druppeltjies water wat rondom die stofdeeltjies gevorm het, tot binne-in die wolke en laat hulle teen mekaar bots. Gewoonlik het elke deeltjie in die wolk ‘n positiewe of negatiewe elektriese lading. Maar wanneer die deeltjies bots, skei die ladings. Die meeste van hierdie positiewe ladings beweeg na die bopunt van die wolk en die negatiewe ladings beweeg na die onderkant van die wolk. Weerlig is ‘n geweldige groot vonk van elektrisiteit in die lug. Hierdie vonk word gevorm wanneer die negatiewe ladings in die donderwolk die positiewe ladings in ‘n ander wolk, of op die grond, teëkom.

Donderweer:

Donderweer is die verskriklike harde geluid wat gemaak word wanneer warm lug skielik koue lug teëkom. Wanneer weerlig die lug ophelder, maak dit ook die lug rondom dit warm. Wanneer hierdie warm lug nou met die koue lug in aanraking kom, veroorsaak ‘n reuse golf van bewegende lug die donderslag van die donderweer.

GEVAARLIKE WEER

Tornado’s

Dit is ‘n baie sterk stormwind en word gevorm wanneer ‘n front met koue en droë lug in aanraking kom met warm, vogtige lug. Dit vorm dan ‘n groot, swart wolk in die lug. As warm lug baie vinnig styg, beweeg nog warm lug onder in om dit te vervang. Dan sal die lug soms begin draai, wat dan ‘n tornado vorm. As dit die grond bereik, kan dit verwoestende skade aanrig, want dit suig alles op wat voorkom.

Orkaan

Dit in ‘n baie groot storm wat op die tropiese oseane begin vorm. Dit bestaan uit ‘n groot hoeveelheid wind en reën wat baie vinnig rondom die middelpunt wat ons “die oog” noem, beweeg. Dit beweeg vorentoe terwyl dit draai en veroorsaak yslike branders wat baie verwoestend is.

Knip 4 blokkies van een A4-bladsy sodat daar genoeg vir die hele klas is. Elke klasmaatjie moet nou een aspek van die weer op die papiertjie teken. Werk mooi netjies en duidelik. Span ‘n wasgoedlyntjie oor die lengte van die klas en hang al die “weerstoestandjies” aan die lyn!

Assessering

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

Assesseringstandaard

Dis duidelik wanneer die leerder

  • 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.

Questions & Answers

what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
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 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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