# 2.3 Making energy available to people

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## Making energy available to people

MAKING ENERGY AVAILABLE TO PEOPLE

Energy from sunlight is stored in and around the earth in several ways. (In some instances temporarily, as when the earth is warmed by the sun, or for longer periods of time, for instance when it is fixed in food). The stored energy can be released later and be used.

Let us take a look at some of the means by which it may be released

## [lo 1.1, 1.2, 1.3, 2.1]

See how many of the following idiomatic expressions that have developed around the idea of wind are known to you?

• We got wind that you were coming (we were given a hint)
• His talk was all wind (it was insubstantial)
• Between wind and water (a vulnerable spot, as the part of a ship that is normally below water but is exposed when the ship rolls)
• How the wind blows (what appears probable)
• In the wind (about to happen)
• Three sheets in the wind (intoxicated or drunk)
• Sail close to the wind (come near the limits of danger)
• Take the wind out of someone’s sails (destroy someone’s advantage)

What is wind?

Blow on your hand. What do you notice?

We cannot see the wind, but we can feel it when it blows against our faces or ruffles our hair.

Washing dries quickly if it is hung out in the wind.

Do you know the reason for this?

How does wind occur?

Complete the sentences to explain the illustration by supplying the missing words:

1. By day the sun . It .

the land.

1. Warm air .
2. Cooler air moves from the to the

to take the place of the warm air.

1. This is how originates.

Make a windmill

• Use stiff paper. Cut it according to the instructions on the illustrations.
• Will this windmill turn in a room where there is no wind?
• What could you do to make it turn?
• Discuss suggestions about how to increase the windmill’s turning speed with your friends and report your ideas to the class.

Folding a small paper glider:

• Fold a sheet of A4 paper in half lengthways.
• Unfold the sheet of paper and fold the two top corners to the central fold so that the top edges lie together.
• Fold the new corners to the central fold, forming a sharp arrow point.
• Fold back the arrow point to the point at which the other points meet.
• Fold along the original lengthways fold again to “close” the structure.
• Fold the bottom corners separately to form wings.
• Fold back both wings along a line lying parallel to the central fold.
• Hold below and throw gently, noting how far the glider glides!
• You may experiment to see which folding pattern allows the glider to glide better. Demonstrate this to the class and motivate your explanation.

Ways in which wind is used to the benefit of people

People have always made use of the power of wind to achieve things.

People have used the wind to their advantage. Sailors use the power of the wind that blows against their sails to drive their ships.

Windmills have been used to grind wheat and wind pumps pump water from below the ground.

The wind blows against the sails of the mill or the vanes of the wind pump to turn them. This turning turns machinery inside the mill. Modern windmills are called turbines and are used to provide electricity.

Class project

Let’s build a kite! First name and describe the materials that we could use for this project. Then form groups to build kites.

## Assessment

LEARNING OUTCOME 1: SCIENTIFIC INVESTIGATIONSThe 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

1.1 plans investigations;

• leads investigations and collects data;
• evaluates data and provides feedback on observations.

LEARNING OUTCOME 2: CONSTRUCTING SCIENCE KNOWLEDGE

The learner will know and be able to interpret and apply scientific, technological and environmental knowledge.

Assessment Standard

We know this when the learner

2.1 recalls significant information.

## Memorandum

What is wind?

I feel air on my hand.

The wind shakes drops of water from the washing. The vapour from the washing disappears into the air.

Where does the wind come from?

Complete the sentences by using the missing words in order to explain the illustration:

1. shines, warm

2. rises

3. sea, land

4. wind

Make a windmill

Use a sheet of firm paper. Fold it according to the instructions on the illustrations.

Does a windmill turn in a room where there is no air current (wind)? No!

What can you do to make it turn? I can run while holding it in the air.

#### Questions & Answers

who was the first nanotechnologist
k
Veysel
technologist's thinker father is Richard Feynman but the literature first user scientist Nario Tagunichi.
Veysel
Norio Taniguchi
puvananathan
Interesting
Andr
I need help
Richard
anyone have book of Abdel Salam Hamdy Makhlouf book in pdf Fundamentals of Nanoparticles: Classifications, Synthesis
what happen with The nano material on The deep space.?
It could change the whole space science.
puvananathan
the characteristics of nano materials can be studied by solving which equation?
sibaram
synthesis of nano materials by chemical reaction taking place in aqueous solvents under high temperature and pressure is call?
sibaram
hydrothermal synthesis
ISHFAQ
how can chip be made from sand
is this allso about nanoscale material
Almas
are nano particles real
yeah
Joseph
Hello, if I study Physics teacher in bachelor, can I study Nanotechnology in master?
no can't
Lohitha
where is the latest information on a no technology how can I find it
William
currently
William
where we get a research paper on Nano chemistry....?
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
revolt
da
Application of nanotechnology in medicine
has a lot of application modern world
Kamaluddeen
yes
narayan
what is variations in raman spectra for nanomaterials
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
what about nanotechnology for water purification
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
STM - Scanning Tunneling Microscope.
puvananathan
how did you get the value of 2000N.What calculations are needed to arrive at it
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