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Tegnologie

Graad 7

Stelsels en beheer: water

Module 1

Water

Agtergrond

Mense gebruik verskillende tipes masjiene om beweging te veroorsaak. In die verlede het krag om hierdie toestelle aan te dryf gekom van mense en diere wat waentjies, ploeë en sleë moes sleep; dus is dit slegs met brute spierkrag aangedryf. Later het die mense geleer om natuurlike kragte soos wind en lopende water ook te benut. Vandag word die meeste masjiene deur elektrisiteit aangedryf. Masjiene het ‘n elektriese motor of masjien wat die krag verskaf sodat ‘n voorwerp kan beweeg.

Kom ons ondersoek die energiebron wat in vloeiende water opgesluit is. Die energie word in ‘n hidro-elektriese kragstasie ingespan om elektrisiteit op te wek.

ONDERSOEK 1

Benodigdhede:

  • ‘n Skêr
  • ‘n Breinaald
  • ‘n Diep skinkbord
  • Twee strooitjies
  • Kleeflint
  • Dun tou
  • Water
  • ‘n Plastiese koeldrankbottel

Opdrag 1:

Om ‘n skets te maak

LU/AS 1.3

Maak ‘n bo-aansigskets met duidelike byskrifte van al die benodigdhede. Gebruik die korrekte verhouding, kleur en hoeveelhede.

Metode:

  1. Sny die boonste gedeelte van die koeldrankbottel af.
  2. Gebruik die breinaald en maak gaatjies rondom die bodem langs die kant ewe ver van mekaar reg rondom die bottel.
  3. Sny die strooitjies in 3 cm lengtes en steek hulle deur die gaatjies.
  4. Gebruik kleeflint om die strooitjies in posisie te hou.
  5. Maak drie gaatjies aan die bokant / rand van die bottel ewe ver uit mekaar.
  6. Maak drie ewe lang lengtes tou aan die gaatjies vas en maak hulle aan een lang stuk tou vas.
  7. Hou die bottel oor die skinkbord en maak die bottel vol water.

Wat is jul waarneming?

Die water spuit by die strooitjies uit en maak dat die bottel in die rondte tol. Dit word ‘ n turbine genoem.

ONDERSOEK 2

Kom ons ondersoek waar in ‘n plastiekbottel vol water die drukking die grootste is.

Benodigdhede:

  • ‘n 2 ℓ plastiek koeldrankbottel
  • ‘n Potlood
  • ‘n Diep skinkbord
  • ‘n Skêr
  • Kleeflint
  • Water

Metode:

  1. Skroef die doppie van die bottel af en maak drie gaatjies ‘n entjie uitmekaar, direk onder mekaar naby die bodem van die bottel. Gebruik ‘n potlood of ‘n skerp voorwerp om dit te doen.
  2. Plak kleeflint oor die gaatjies.
  3. Maak die bottel vol water.
  4. Trek nou die kleeflint vinnig en terselfdertyd af.

Wat is jul waarneming?

Die water spuit by die gaatjies uit. Die onderste stroom water spuit die verste.

Opdrag 2:

Om ‘n skets te maak

LU/AS 1.3

Maak ‘n skets met byskrifte om jou waarnemings te demonstreer. Gebruik gepaste kleur en skaduwee.

Waarom?

Lug druk op die water bo in die bottel. Die water bo druk op die water onder, daarom word die water wat onder in die bottel is met ‘n groter krag uitgedruk.

Assessering

Leeruitkomstes(LUs)
LU 1
Tegnologiese Prosesse en VaardighedeDie leerder is in staat om tegnologiese prosesse en vaardighede eties en verantwoordelik toe te pas deur gepaste inligtings- en kommunikasietegnologie te gebruik.
Assesseringstandaarde(ASe)
Dit is duidelik wanneer die leerder:
ondersoek :
1.2 bestaande produkte ondersoek wat toepaslik is vir ‘n probleem, situasie of behoefte gebaseer op die volgende kernaspekte van ontwerp:1.2.1 mense;1.2.2 doel;1.2.3 voorkoms;1.2.4 omgewing;1.2.5 veiligheid;1.2.6 koste;
1.3 ondersoek uitvoer deur middel van eenvoudige praktiese toetse met betrekking tot aspekte van die tegnologiese kennisvelde (Strukture, Verwerking, Stelsels en Beheer);

Memorandum

Opdrag 1

Leerders kan die voorwerpe bring en dit kan in die middel van ‘n groep geplaas word waarna elkeen dit kan skets in die gegewe spasie. Kleur en byskrifte moet dit ook vergesel.

Ondersoek 1

Die leerders kan die ondersoek in ‘n groep doen.

Ondersoek 2

Die leerders kan die ondersoek ook in ‘n groep doen.

Opdrag 2

Dit is belangrik om korrek waar te kan neem en met behulp van ‘n skets die waarneming te kan demonstreer. Die agtergrond oor waterwiele kan m.b.v. sketse en aanvullende leermateriaal aan die leerders bekend gestel word

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, Tegnologie graad 7. OpenStax CNX. Sep 10, 2009 Download for free at http://cnx.org/content/col11031/1.1
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