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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

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In economics, a perfect market refers to a theoretical construct where all participants have perfect information, goods are homogenous, there are no barriers to entry or exit, and prices are determined solely by supply and demand. It's an idealized model used for analysis,
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AI-Robot
When MP₁ becomes negative, TP start to decline. Extuples Suppose that the short-run production function of certain cut-flower firm is given by: Q=4KL-0.6K2 - 0.112 • Where is quantity of cut flower produced, I is labour input and K is fixed capital input (K-5). Determine the average product of lab
Kelo
Extuples Suppose that the short-run production function of certain cut-flower firm is given by: Q=4KL-0.6K2 - 0.112 • Where is quantity of cut flower produced, I is labour input and K is fixed capital input (K-5). Determine the average product of labour (APL) and marginal product of labour (MPL)
Kelo
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Quantity demanded refers to the specific amount of a good or service that consumers are willing and able to purchase at a give price and within a specific time period. Demand, on the other hand, is a broader concept that encompasses the entire relationship between price and quantity demanded
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Economic growth as an increase in the production and consumption of goods and services within an economy.but Economic development as a broader concept that encompasses not only economic growth but also social & human well being.
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it is a curve that we get after connecting the pareto optimal combinations of two consumers after their mutually beneficial trade offs
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In economics, the contract curve refers to the set of points in an Edgeworth box diagram where both parties involved in a trade cannot be made better off without making one of them worse off. It represents the Pareto efficient allocations of goods between two individuals or entities, where neither p
Cornelius
In economics, the contract curve refers to the set of points in an Edgeworth box diagram where both parties involved in a trade cannot be made better off without making one of them worse off. It represents the Pareto efficient allocations of goods between two individuals or entities,
Cornelius
Suppose a consumer consuming two commodities X and Y has The following utility function u=X0.4 Y0.6. If the price of the X and Y are 2 and 3 respectively and income Constraint is birr 50. A,Calculate quantities of x and y which maximize utility. B,Calculate value of Lagrange multiplier. C,Calculate quantities of X and Y consumed with a given price. D,alculate optimum level of output .
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Answer
Feyisa
c
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the market for lemon has 10 potential consumers, each having an individual demand curve p=101-10Qi, where p is price in dollar's per cup and Qi is the number of cups demanded per week by the i th consumer.Find the market demand curve using algebra. Draw an individual demand curve and the market dema
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suppose the production function is given by ( L, K)=L¼K¾.assuming capital is fixed find APL and MPL. consider the following short run production function:Q=6L²-0.4L³ a) find the value of L that maximizes output b)find the value of L that maximizes marginal product
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types of unemployment
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What is the difference between perfect competition and monopolistic competition?
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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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