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Natural sciences

Grade 4

Energy and change

Module 29

Wind as a source of energy


To talk about wind as an enjoyable source of energy

[lo 3.2]

Being out of doors on a windy day can make us feel energetic. There are many ways in which we can enjoy the wind.

Form groups and take a minute to think about the nicest way in which one could enjoy the wind.

When groups report back, decide which idea will be the cheapest to follow, and which will be the most expensive.

Which group’s idea will require the least effort, and which will require the most effort?

Write labels for the following pictures.

Identifying other uses of wind [lo 1.3]

Plants also make use of the wind!

Wind disperses the seeds of plants and trees. Plants that use the wind in this way have very light seeds.

Interesting facts: Some seeds have wings that help them to “fly”.

Other seeds glide like parachutes.

The feathers of birds help them to glide on the wind. If the wind is strong, birds are assisted to fly for hundreds of kilometres when they migrate to other countries.

Some animals, rabbits for instance, sniff the air when they are eating. Because the wind carries the smell of their enemies, they are warned of danger.

The pilot of an aeroplane depends on the windsock at the airport so that he or she can determine from which direction for taking off or landing. The windsock also indicates the direction of the wind.


LEARNING OUTCOME 1 : SCIENTIFIC INVESTIGATIONS The learner will be able to act confidently on curiosity about natural phenomena, and to investigate relationships and solve problems in scientific, technological and environmental contexts.

Assessment standard

We know this when the learner

  • evaluates data and provides feedback on observations.


Assessment standard

We know this when the learner

  • understands the impact of Science and Technology.


If one is out of doors on a windy day, one can feel very energetic. There are many ways in which one can enjoy the wind.

  • Write captions to the following pictures.

One can participate in water sports.

One can fly in a glider!

One can fly a kite.

Let us think of conditions when the wind could be dangerous

1. Trees can be uprooted, they can destroy motor cars and houses, roads can be blocked, power lines can be blown down and homes can be left without electricity.

2. Storms at sea can cause flooding on land, and ships can be wrecked.

3. Tornadoes are the strongest kind of wind-storms and can have a velocity (speed) of up to 300 km per hour. A tornado can cause incredible damage.

4. Wind can cause soil erosion. Think of ways in which it can be prevented.

5. If the wind blows from one direction all the time, trees can grow skew. How can we live safely in such conditions?

6. If a veld fire occurs, wind can make it worse and massive plantations can be destroyed.

7. Breakwaters can be built along the coast to prevent the water from flooding the land.

8. Some animals live safely in their underground tunnels.

9. In dangerous places bridges and roads are closed temporarily so that motorists will not travel there.

10. Rows of trees and hedges can be planted along cultivated fields to prevent the crops from being damaged.

Questions & Answers

what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
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
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
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
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.
what is the actual application of fullerenes nowadays?
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.
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.
is Bucky paper clear?
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.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
how to synthesize TiO2 nanoparticles by chemical methods
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Source:  OpenStax, Natural sciences grade 4. OpenStax CNX. Sep 18, 2009 Download for free at http://cnx.org/content/col11096/1.1
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