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Tegnologie

Graad 5

Ontdek strukture

Module 10

Inleiding tot strukture

AGTERGROND

Enige voorwerp is ‘n soort struktuur . Slaan in die verklarende woordeboek na wat die vetgedrukte woord beteken en skryf dit neer.

Opdrag 1

Wat is die nut van strukture?

Voltooi : (Kies uit die volgende moontlikhede: brug, ‘n kamer, mandjie, kartondoos vir appels, boekrak)

‘n Struktuur: a) bevat dinge, bv. _ en/of

b) beskerm dinge, bv. _ en/of

c) ondersteun dinge, bv. _ en/of

d) omsluit ‘n ruimte, bv. _ en/of

e) strek oor ‘n afstand, bv. _

[LU 2.1]

‘n Huis is ‘n struktuur wat al bogenoemde funksies verrig. Dit bevat meubels, beskerm jou en jou besittings wat daarin bly, ondersteun die dak, omsluit ruimtes en strek oor ‘n afstand.

Opdrag 2

‘n Struktuur moet sy eie gewig en die las wat dit moet dra, kan ondersteun en nogtans sy vorm behou. ‘n Las kan ‘n voorwerp, ‘n persoon of ‘n krag wees. Wat is die las in elk van die volgende voorbeelde?

[LU 2.1]

Opdrag 3

Hoe kragte op strukture inwerk

Watter invloed oefen kragte op strukture uit?

  1. Dit _ voorwerpe beweeg.
  2. Dit _ dat voorwerpe beweeg.
  3. Dit verander die _ van beweging.
  4. Dit verander die _ van beweging.
  5. Dit verander die _ van voorwerpe.

[LU 2.1]

Opdrag 4

Die uitwerking van kragte kan nie altyd gesien word nie.

Wat veroorsaak die hoofkragte wat op dele van strukture werk? (Kyk by Opdrag 2)

  1. Die _ wat op die strukture geplaas word.
  2. Die _ van die struktuur self.

[LU 2.1]

Opdrag 5

Watter twee kragte werk op strukture in?

  1. __ pers ‘n deel van ‘n struktuur saam deur te probeer omdie kante nader aan mekaar te druk.
  2. __ rek ‘n deel van ‘n struktuur deur te probeer om deleuit mekaar te trek.

Ons sê ‘n deel van die struktuur is in 'n _ of _ toestand.

Pale word saamgedruk, of is onder druk.

Die mure van die huis word saamgedruk, of is onder druk.

Die kettings van die swaai word getrek, of is onder spanning.

Die lang ketting en die twee kort skakels op hierdie uithangbord word getrek, of is onder spanning.

[LU 2.1]

Opdrag 6

Kragte wat op ‘n struktuur inwerk, kan die dele van die struktuur laat meegee

of vervorm. ‘n Deel se weerstand teen vervorming hang af van

a) die _ waarvan dit gemaak is,

b) sy _

c) sy _

d) en die _ waarop jy dit probeer buig.

Strukture moet _ , _ en _ wees sodat dit nie inmekaar stort of omval wanneer jy ‘n las daarop plaas nie.

[LU 2.1]

Opdrag 7A

Kom ons ondersoek die vertikale sterkte van dopstrukture:

Opdrag aan die opvoeder:

Verdeel die klas in groepe. Deel aan elke groep ses A4-manillas van dieselfde dikte uit, asook ‘n blik met los spykers en ‘n plat stuk dik karton van 10 cm by 10 cm.

Opdrag aan elke groep:

Vou elke manilla soos wat in die sketse verduidelik word sodat dit ‘n blik met spykers daarin kan ondersteun. Ondersoek elke manier en besluit watter struktuur die swaarste las kan ondersteun. Die hoogte van jul struktuur moet die breedte van die manilla wees. Julle mag die manilla vou en op vyf plekke met maskeerband plak. Elke stuk maskeerband moet 5 cm lank wees. Die plat stuk dik karton moet op die struktuur geplaas word met die blik spykers bo-op. Kyk watter struktuur die meeste spykers kan ondersteun. Maak ‘n regmerkie by die skets van die struktuur wat die swaarste las kan ondersteun.

Questions & Answers

so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
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
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, Tegnologie graad 5. OpenStax CNX. Sep 23, 2009 Download for free at http://cnx.org/content/col10978/1.2
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