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Natuurwetenskappe

Energie-oordrag en kragte

A. kragte

Opvoeders afdeling

Memorandum

Leerder skryf ‘n paragraaf oor gravitasiekrag of elektrostatiese krag. Hulle kan van bronne voorsien word.

LEERDER AFDELING

Inhoud

Aktiwiteit: om die werking van elektrostatiese of gravitasiekrag te beskryf [lu 2.1]

Ons gaan later in die module meer van magnetisme leer. Kies dus een van die ander twee kragte wat op ‘n afstand werk en skryf ‘n paragraaf om dit te omskryf en te verduidelik hoe dit werk.

3. Die meting van krag

Kragte kan gemeet word deur te kyk hoeveel dit ‘n spiraalveer of ‘n gomlastiekrekkie laat rek. ‘n Britse wetenskaplike, Robert Hooke het baie jare gelede ontdek dat die uitrekking van ‘n veer eweredig is aan die krag wat die uitrekking veroorsaak. Indien ‘n sekere krag die veer 1 cm uitrek, sal ‘n krag wat drie keer so groot is, die veer 3 cm laat uitrek. Hoe swaarder die voorwerp, hoe meer rek die veer uit.

As ‘n voorwerp swaar is, sê ons die trekkrag tussen die aarde en die voorwerp is groot. Ons kan dus sê dat gewig ‘n krag is. Gewig is die aantrekkingskrag van die aarde op die voorwerp. Die gewig van ‘n voorwerp kan dus bepaal word deur te meet hoeveel ‘n veer uitrek.

Die eenheid waarin ons krag (gewig) meet, is die newton (N). Dit is genoem na sir Isaac Newton, een van die grootste wetenskaplikes van alle tye. Om ‘n krag te meet, kan ons gebruik maak van ‘n trekskaal wat in newton gekalibreer is. Ons kan dit dan ook ‘n kragmeter noem.

Assessering

Leeruitkomste 2: Die leerder ken, interpreteer en pas wetenskaplike, tegnologiese en omgewingskennis toe.

Assesseringstandaard 2.1: Dit is duidelik wanneer die leerder betekenisvolle inligting onthou: onthou, ten minste, definisies en komplekse feite.

Questions & Answers

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 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
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
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
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
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
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 7. OpenStax CNX. Sep 16, 2009 Download for free at http://cnx.org/content/col11078/1.1
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