Amazing construction of tall buildings 2 : Ark Hotel Construction time lapse building 15 storeys in 2 days (48 hrs)
Read User's Comments(0)
Year 4 Science...What are synthetic fabrics ?
Synthetic fabrics are textiles made from synthetic fibers. They are used primarily to make clothing. A synthetic fabric is plastic fabric. Some of the examples of synthetic clothings were usually made of polyester, acrylic, and nylon. A synthetic fibre, when magnified, looks like plastic spun together.Man-made fabrics, also known as synthetic fabrics include fabrics such as rayon, acetate, nylon, acrylic, polyester, olefin, spandex, lastex and kevlar. These fabrics have many different uses and qualities, some which can not be achieved with natural fibers. With synthetic fibers one can create waterproof fabrics and fabrics with an excellent amount of stretch used for swimwear and lingerie.
The fabric is made from chemically produced fibers. The chemicals used to make the fibers are sodium hydroxide and carbon di-sulphide which are derived from coal, oil, or natural gas. The chemicals are in liquid form and are forced through tiny holes called spinnerets. As the liquid comes out of the spinnerets and into the air, it cools and forms into tiny threads. Dyes are added to these threads before they are woven together to make the fabric.
Depending on the fabric, other chemicals are added to make the fabric softer, wrinkle free, flame-resistant, water resistant, stain-resistant, and moth-repellant.
While all these qualities are desirable, they can have harmful effects on the environment, wildlife and our health, especially for those who work to produce the fabrics. The chemicals leach out into the waterways, airways and pollute the ground, water and even the air we breathe. Also these fabrics are non-biodegradable, which means they do not breakdown in the soil.
( Abstracted from : http://en.wikipedia.org/wiki/Synthetic_fabric )
 |
| Nylon fabrics |
 |
| Rayon fabrics |
How it's made milk...Food processing in Year 6 Science
Watch the video clips below about how is milk being processed...watch how smart the cows are ! Click to the highlighted link below
How milk is made
Solar eclipse...in Year 6 Science
A total solar eclipse
As seen from the Earth, a solar eclipse occurs when the Moon passes between the Sun and Earth, and the Moon fully or partially blocks the Sun. This can happen only at a new moon, when the Sun and the Moon are in conjunction as seen from Earth in an alignment. In total eclipse, the disk of the Sun is fully obscured by the Moon. In partial eclipse only part of the Sun is obscured.
An eclipse is a natural phenomenon. Nevertheless, in some ancient and modern cultures, solar eclipses have been attributed to supernatural causes or regarded as bad omens. A total solar eclipse can be frightening to people who are unaware of its astronomical explaination, as the Sun seems to disappear during the day and the sky darkens in a matter of minutes.
Because it is dangerous to look directly at the Sun, observers should use special eye protection or indirect viewing techniques when viewing a partial eclipse, or the partial phases of a total eclipse.
( Adapted from http://en.wikipedia.org/wiki/Solar_eclipse )
Watch the solar eclipse...click to the highlighted link below
solar eclipse in Varanasi
Lunar eclipse...in Year 6 Science
A lunar eclipse occurs when the Moon passes directly behind the Earth into its umbra ( shadow ). This can occur only when the Sun, Earth, and the Moon are aligned exactly, or very closely so, with the Earth in the middle. Hence, a lunar eclipse can only occur in the night of a full moon. The type and length of an eclipse depend upon the Moon's location relative to its orbital nodes. Unlike a solar eclipse, which can only be viewed from a certain relatively small area of the world, the lunar eclipse may be viewed from anywhere on the night side of the Earth. A lunar eclipse lasts for a few hours, whereas a total solar eclipse lasts for only a few minutes at any given place, due to the smaller size of the moon's shadow. Also unlike solar eclipses, lunar eclipses are safe to view without any eye protection or special precautions, as they are no brighter than the full moon itself.
The shadow of the Earth can be divided into two distinctive parts : the umbra and penumbra. A partial lunar eclipse occurs when only a portion of the Moon enters the umbra. When the Moon travels completely into the Earth's umbra, one observes a total lunar eclipse. The Moon's speed through the shadow is about one kilometer per second. The toatal time between the Moon's first and last contact with the shadow is much longer, and could last up to 4 hours.
( Adapted from http://en.wikipedia.org/wiki/Lunar_eclipse )
Watch the video clip of lunar eclipse...
Year 5 Science- Question 1
Adam carried out an investigation to study the relationship between two animals. The investigation is carried out for five weeks.
Week
|
1
|
2
|
3
|
4
|
5
|
Number of grasshopper
|
80
|
70
|
60
|
50
|
40
|
Number of frog
|
10
|
11
|
12
|
14
|
14
|
a ) What is the purpose ( aim ) of this investigation ?
________________________________________________________________________
b) What is the trend of change in the number of grasshopper as the number of frog increases ?
________________________________________________________________________
c) State on reason ( inference ) about the number of grasshopper based on the
observation in this investigation.
________________________________________________________________________
d) Predict the number of grasshopper in the 8th week.
________________________________________________________________________
My Year 6 Science Pickling Project- Food Preservation
6 Arif's Pickling Project...watch how they had carried out their project with guidance and the end products were so yummy...
How silk cloth is made ? Year 4 Science
Watch how silk cloth is made from the cocoons of silkworms...
Silk - Natural Materials in Year 4 Science
What is silk made of ?
 |
| silkmoths |
 |
| silkworms ] |
The silkworm is the larva or caterpillar of the domesticated silkmoth, Bombyx mori
( Latin : “ silkworm of the mulberry tree ”). It is an economically important insect being a primary producer of silk. A silkworm’s preferred food is white mulberry leaves, but it may also eat the leaves of any other mulberry tree as well as the Osage Orange.
 |
| Osage Orange |
 |
| Cocoons |
 |
| Mulberry leaves |
The silkworm is entirely dependent on humans for its reproduction and does not occur
naturally in the wild. The eggs of the silkmoth take about fourteen days to
hatch into larvae, which eat continuously. Their droppings are black. After
molting about four times, their bodies become slightly yellow and the skin
becomes tighter. The larvae will then enter the pupa phase of their life cycle
and enclose themselves in a cocoon made up of raw silk produced by the salivary
glands. the cocoon provides a vital layer of protection during the vulnerable,
almost motionless pupal state. The cocoon is made of a thread of raw silk from 300 to about 900 meters. The fibers are very fine and lustrous, about 10 micrometers in diameter. About 2 000 to 3 000 cocoons are required to make a pound of silk ( 0.4 kg ).
( adapted from : http ://en.wikipedia.org/wiki/Bombyx.mori )
( adapted from : http ://en.wikipedia.org/wiki/Bombyx.mori )
A silkworm spinning its cocoon
Famous Scientists of Transportations in Year 4 Science
Do you know them ? These are
some great scientists who had invented the transports you are using today ...
George Stephenson ( 9 June 1781 - 12 August 1848 ) was an English civil engineerand mechanical engineer who built the first public inter-city railway line in the world
to use steam locomotives, the Liverpool and Manchester Railway which opened in1830. He was renowned as the " Father of Railways ".
Gottlieb Daimler, ( March 17, 1834 - March 6, 1900 ), was an engineer, industrial designer and industrialist born in Schorndorf ( Kingdom of Wurttemberg, a federal state of the German Confederation ), in what is now Germany. He was a pioneer of internal-combustion engines and automobile development. He invented the high speed petrol engine and the first four-wheel automobile.
Karl Friedrich Benz, ( November 25, 1844 - April 4, 1929 ) was a German engine designer and car engineer, generally regarded as the inventor of the gasoline-powered automobile, and together with Bertha Benz pioneering founder of the automobile manufacturer Mercedez Benz.
Henry Ford, who was born on 30 July 1863 on his family's farm in Dearborn, Michigan, was the manufacturer of automobile. Ford incorporated the Ford Motor Company in 1903, proclaiming, " I will build a car for the great multitude. " In October 1908, he did so, he invented the Model T. The Model T heralds the beginning of the Motor Age.
.jpg)
- Orville Wright is best known for inventing the airplane, along with his brother Wilbur.
Wilbur Wright is best known for developing the first successful airplane, along with his brother, Orville.
Born four years apart, brothers Wilbur and Orville Wright grew up in a small town in Ohio. They shared an intellectual curiosity and an aptitude for science, at a time when the possibility of human flight was beginning to look like a reality. Together, the Wright brothers developed the first successful airplane in Kittyhawk, North Carolina - and together they became national heroes. Considered the fathers of modern aviation, they developed innovative technology and inspired imaginations around the world.
Year 6 Science Question - Exercise 3
An investigation is carried out by a group of pupils. Two similar cages are prepared and labelled K and L. One chick is put in cage K while five chicks are put in cage L. All the chicks are of the same size and weight. Equal amount of food and water are supplied to the chicks every day. The observations after one month are recorded in the table below.
Cage
|
K
|
L
|
Average
weight of chicks ( g )
|
1 800
|
500
|
a) What is the purpose ( aim ) of this investigation ?
__________________________________________________________________
b) State
i) what is changed ( manipulated variable ) in this investigation.
___________________________________________________________________
ii) what is observed ( responding variable ) in this investigation.
___________________________________________________________________
c) State one relationship between the manipulated variable and the responding
variable.
___________________________________________________________________
d) What is kept the same ( constant variable ) in this investigation ?
_____________________________________________________________________
Year 6 Science Questions - Exercise 2
A glass of fresh milk was left on the table.
a) Give one characteristic of the milk after being left for two days.
____________________________________________________________________
b) State one reason ( inference ) based on your answer in ( a ).
_____________________________________________________________________
c) What do you think would have happened if the milk had been kept in the
refrigerator ?
_______________________________________________________________________
Year 6 Science Questions-Exercise 1
Question 1
The table below shows the number of mango slices and the
volume of concentrated sugar solution
used to preserve the mango slices.
Number of mango slices
|
10
|
20
|
30
|
40
|
Volume of concentrated sugar solution ( ml )
|
50
|
100
|
150
|
200
|
a) What is the purpose ( aim ) of this investigation ?
______________________________________________________________________
b) State
i) what is kept the same ( constant variable ) in
this investigation ?
______________________________________________________________________
ii) what is changed ( manipulated variable ) in this investiagation.
______________________________________________________________________
iii) what is observed
( responding variable ) in this investigation.
______________________________________________________________________
c) State one
relationship between the manipulated variable responding variable that can be made in this
investigation.
______________________________________________________________________
d) State the
preservation method used in this
investigation.
______________________________________________________________________
Quiz Questions
.jpg) |
| Think carefully before you answer ! |
1. Name two birds that cannot fly.
2. Name three plants that reproduce through leaves.
3. When was the first telephone being invented ?
4. Name two types of bacteria used in milk culture.
5. Name three types of synthetic fabric.
6. Name three types of epiphyte plants.
7. Name three types of diseases that were caused by virus ?
8. Name three types of edible fungi.
9. Which colour is the best reflector of light ?
10. Name three characteristics of a mammal.
My Year 6 pupils with their PowerPoint presentations...
Danial with his presentation on " The Effects of Human Activities on the Environment
Edriana with her presentation on " Food Preservation "
Shaqif with his presentation on " Food Preservation "
Pupils watching the PowerPoint presentations...
Well done all my 6 Arif's pupils...I am pleased with your presentations...keep it up ! Thank you for praticipating in this Science PowerPoint Presentation Project.
My Year 6 pupils' Science project - PowerPoint presentations
.jpg)
Click to the highlighted link to see the presentation
Year 5 Science...Where do we get electricity ?
These are sources of electricity...
.jpg)
Click to the highlighted link below to watch the video clips.
The hydroelectric station...how does it work ?
The nuclear power station..how does it work ?
The wind turbine...how does it work ?
The solar panel...how does it work ?
Year 4 Science...What is photosynthesis ?
Green plants absorb light energy using chlorophyll in their leaves. They use it to react carbon dioxide with water to make a sugar called glucose. The glucose is used in respiration, or converted into starch and stored. Oxygen is produced as a by-product.
This process is called photosynthesis. Temperature, carbon dioxide concentration and light intensity are factors that can limit the rate of photosynthesis.
Plants also need mineral ions, including nitrate and magnesium, for healthy growth. They suffer from poor growth in conditions where mineral ions are deficient.
Photosynthesis
Photosynthesis is the chemical change which happens in the leaves of green plants. It is the first step towards making food - not just for plants but ultimately every animal on the planet.
During this reaction, carbon dioxide and water are converted into glucose andoxygen. The reaction requires light energy, which is absorbed by a green substance called chlorophyll.
Photosynthesis takes place in leaf cells. These contain chloroplasts, which are tiny objects containing chlorophyll.
Here is the equation for photosynthesis:
carbon dioxide + water (+ light energy) -------> glucose + oxygen
'Light energy' is shown in brackets because it is not a substance. You will also see the equation written like this:
Plants absorb water through their roots, and carbon dioxide through their leaves. Some glucose is used for respiration, while some is converted into insolublestarch for storage. The stored starch can later be turned back into glucose and used in respiration. Oxygen is released as a by-product of photosynthesis.
Abstracted and ref :
http://www.bbc.co.uk/schools/gcsebitesize/science/add_aqa_pre_2011/plants/plants1.shtml
Subscribe to:
Posts (Atom)