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Natuurwetenskappe

Graad 4

Energie en verandering

Module 29

Wind as bron van energie

Aktiwiteit 1:

Om oor wind as ‘n genotvolle bron van energie te gesels

[lu 3.2]

Om buite te wees op ‘n winderige dag, kan ‘n mens baie energiek laat voel. Daar is baie maniere om die wind te geniet.

  • Dink vinnig in julle groepe wat vir julle die lekkerste manier sal wees om die wind te geniet.
  • As julle terugvoering gee, werk uit watter groep se idee die goedkoopste sal wees en watter een s’n die duurste sal wees.
  • Watter groep se idee is die minste moeite en watter groep se idee is die meeste moeite?
  • Skryf byskrifte by die volgende prentjies.

Aktiwiteit 2:

Om ander gebruike van wind te identifiseer

[LU 1.3]

Plante gebruik ook die wind!

Wind versprei sade van plante en bome. Saadjies is baie lig en kan dus maklik versprei word.

Oulike feite: Sommige saadjies het vlerkies wat hulle maklik kan laat ‘vlieg’.

Sommige saadjies sweef soos valskermpies.

Voëls se vere help hulle om in die wind te sweef. As die wind matig is, help dit byvoorbeeld swaeltjies om duisende kilometers ver na warmer lande te migreer.

Party diere, soos hasies byvoorbeeld, ruik die lug terwyl hulle eet. Omdat die wind die reuk van hul vyande dra, word hulle sodoende teen die dreigende gevaar gewaarsku.

Die loodse van vliegtuie gebruik die windkous op die lughawe, sodat hulle kan sien van watter kant af hulle moet land en opstyg. Dit wys ook hoe sterk die wind waai.

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.

Assesseringstandaard

Dit is duidelik wanneer die leerder

1.3 data evalueer en bevindings kommunikeer.

LEERUITKOMS 3: WETENSKAP, DIE SAMELEWING EN DIE OMGEWINGDie leerder is in staat om begrip van die onderlinge verband tussen wetenskap en tegnologie, die samelewing en die omgewing te toon.

Assesseringstandaard

Dit is duidelik wanneer die leerder

3.2 die impak van wetenskap en tegnologie verstaan.

Memorandum

Om buite te wees op ‘n winderige dag, kan ‘n mens baie energiek laat voel. Daar is baie maniere om die wind te geniet.

Skryf byskrifte by die volgende prentjies.

Ons kan watersport beoefen.

Ons kan in ‘n sweeftuig vlieg!

Ons kan ‘n vlieër laat vlieg.

Kom ons kyk nou wanneer wind gevaarlik kan wees

1. Bome waai om, verwoes motors en huise, paaie word versper, kragdrade kan omwaai en huise sonder elektrisiteit laat.

2. Storms op see kan die land laat oorstroom en skepe laat vergaan.

3. Tornado’s is die sterkste wind en kan tot 300 km per uur waai en ontsettende skade aanrig.

4. Wind kan gronderosie veroorsaak. Dink aan maniere hoe dit voorkom kan word.

5. As die wind heeltyd in een regtig waai, kan bome so skeef groei. Hoe kan ons veilig in sulke wind bly?

6. As ‘n veldbrand uitbreek, kan wind dit aanhelp en groot plantasies kan vernietig word.

7. Breekwaters word langs die see gebou om te voorkom dat die water nie op die land spoel nie.

8. Sommige diertjies bly veilig in hulle ondergrondse tonnels.

9. Op gevaarlike plekke word brûe en bergpaaie tydelik toegemaak sodat motoriste nie daar kan kry nie.

10. Rye bome en heinings kan langs landerye geplant word om te voorkom dat oeste beskadig 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, Natuurwetenskappe graad 4. OpenStax CNX. Sep 18, 2009 Download for free at http://cnx.org/content/col11097/1.1
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