These animation are suitable in teaching breathing respiration for year 4 students. It is easy to understand, fun and attrative.
Saturday, 28 January 2012
Thursday, 3 November 2011
Wednesday, 2 November 2011
Science Project(4)~~ make the rainbow
Introduction:
Sunlight or electric light is called 'white light', because it appears to be colourless. The reality is that 'white light' is made up of a mixture of different colours called a 'spectrum', when broken up. These colours can be observed when white light passes through a transparent substance, such as water or glass. A 'spectrum' consists of the seven colours of the rainbow: red, orange, yellow, green, blue and violet – as well as two other invisible colours called: ultra-violet and infra-red. Isaac Newton used a 'prism' to split up white light into different colours. In this science experiment we will use water and a mirror to do the same.
Materials:
LARGE, DEEP TRAY
WHITE CARDBOARD
MIRROR
TAP WATER
Procedure:
1. Fill a large, deep tray with some water and place it up against a wall outside on a sunny day. Position the tray so that the sunlight falls onto the mirror.
2. Rest a flat mirror upright against the inside, so that it is supported by the wall if necessary.
3. Hold a sheet of white cardboard in front of the mirror and move it around until a rainbow of colours appears on it! You might have to adjust the position of the mirror and the cardboard several times to get the best results.
Sunlight or electric light is called 'white light', because it appears to be colourless. The reality is that 'white light' is made up of a mixture of different colours called a 'spectrum', when broken up. These colours can be observed when white light passes through a transparent substance, such as water or glass. A 'spectrum' consists of the seven colours of the rainbow: red, orange, yellow, green, blue and violet – as well as two other invisible colours called: ultra-violet and infra-red. Isaac Newton used a 'prism' to split up white light into different colours. In this science experiment we will use water and a mirror to do the same.
Materials:
LARGE, DEEP TRAY
WHITE CARDBOARD
MIRROR
TAP WATER
Procedure:
1. Fill a large, deep tray with some water and place it up against a wall outside on a sunny day. Position the tray so that the sunlight falls onto the mirror.
2. Rest a flat mirror upright against the inside, so that it is supported by the wall if necessary.
3. Hold a sheet of white cardboard in front of the mirror and move it around until a rainbow of colours appears on it! You might have to adjust the position of the mirror and the cardboard several times to get the best results.
Saturday, 29 October 2011
Friday, 28 October 2011
Science Project(3)~~ make a sundial to tell the time
Introduction:
At the same time the Egyptians invented the 'shadow clock', other cultures also developed a need to organize their time more efficiently. Amongst others, the Chinese, Greeks and the Romans developed another device for telling the time known as a 'sundial'. Sundials do not necessarily work better than shadow clocks, it is just a slight variation to the shadow clock. Make your own 'sundial' to tell the time in this science experiment.
Materials:
PROTRACTOR
STIFF CARD
COMPASS
THICK CARDBOARD
GLUE
SCISSORS
Procedure:
1. On a stiff piece of cardboard, draw a right angled triangle as in the diagram above. The short sides of the triangle should be about 150mm long, whereas the long side will be about 200mm, depending on the longitudinal angle used for your town. Make sure that you also add the base, below the dotted line.
2. Cut out the triangle, and make a fold along the dotted line to form the base for the triangle to stand on.
3. Make a thick base for your sundial out of corrugated cardboard or wood of about 150x300mm in size. Draw a semi-circle on the base as shown in the diagram above.
4. Glue the folded part of the triangle firmly to the base and place the sundial on a flat surface outside so that the triangle points north / south.
5. Mark the position of the shadow that falls on the base every hour. Notice that the shadow travels the same distance along the semi-circle every hour. On a sunny day you will now be able to tell the time by looking at the position of the shadow on your sundial!
At the same time the Egyptians invented the 'shadow clock', other cultures also developed a need to organize their time more efficiently. Amongst others, the Chinese, Greeks and the Romans developed another device for telling the time known as a 'sundial'. Sundials do not necessarily work better than shadow clocks, it is just a slight variation to the shadow clock. Make your own 'sundial' to tell the time in this science experiment.
Materials:
PROTRACTOR
STIFF CARD
COMPASS
THICK CARDBOARD
GLUE
SCISSORS
Procedure:
1. On a stiff piece of cardboard, draw a right angled triangle as in the diagram above. The short sides of the triangle should be about 150mm long, whereas the long side will be about 200mm, depending on the longitudinal angle used for your town. Make sure that you also add the base, below the dotted line.
2. Cut out the triangle, and make a fold along the dotted line to form the base for the triangle to stand on.
3. Make a thick base for your sundial out of corrugated cardboard or wood of about 150x300mm in size. Draw a semi-circle on the base as shown in the diagram above.
4. Glue the folded part of the triangle firmly to the base and place the sundial on a flat surface outside so that the triangle points north / south.
5. Mark the position of the shadow that falls on the base every hour. Notice that the shadow travels the same distance along the semi-circle every hour. On a sunny day you will now be able to tell the time by looking at the position of the shadow on your sundial!
Thursday, 27 October 2011
Science Project(2) ~~ which material works best as a heat insulator
Introduction:
Air can be quite an effective heat insulator as it does not let heat pass through it easily. A thermos flask, polystyrene cup, or double glazed windows are all good examples of a layer of air acting as a form of insulation against heat loss. Insulating an object can then prevent heat from either moving into an object as well as preventing heat moving out of an object. Test some ordinary household materials in the following science experiment to test which works best as an insulator against heat loss.
Materials:
4x GLASS JARS
RUBBER BANDS
HOT WATER
WOOL SOCK
ALUMINIUM FOIL
NEWSPAPER
BUBBLE WRAP
THERMOMETER
Procedure:
1. Pour some hot water into four equally sized glass jars to exactly the same level about ¾ full.
2. Place the jars in a row on a table or even work surface and cover each of the jars with one of the following household materials: Wool sock, aluminium foil, newspaper and bubble wrap. Secure each of the materials over the mouths of the jars with rubber bands.
3. Leave the jars for about 5 minutes and then remove the covers. Use a thermometer to measure the temperatures of each of the jar's contents and record your results. Place the covers back after taking the readings.
4. Repeat step 4 every five minutes for about 25 minutes or until the water becomes to cool to have any significant effect on the experiment results. Record your results in a chart.
5. The jug with the warmest water had the best insulator as a cover!
Air can be quite an effective heat insulator as it does not let heat pass through it easily. A thermos flask, polystyrene cup, or double glazed windows are all good examples of a layer of air acting as a form of insulation against heat loss. Insulating an object can then prevent heat from either moving into an object as well as preventing heat moving out of an object. Test some ordinary household materials in the following science experiment to test which works best as an insulator against heat loss.
Materials:
4x GLASS JARS
RUBBER BANDS
HOT WATER
WOOL SOCK
ALUMINIUM FOIL
NEWSPAPER
BUBBLE WRAP
THERMOMETER
Procedure:
1. Pour some hot water into four equally sized glass jars to exactly the same level about ¾ full.
2. Place the jars in a row on a table or even work surface and cover each of the jars with one of the following household materials: Wool sock, aluminium foil, newspaper and bubble wrap. Secure each of the materials over the mouths of the jars with rubber bands.
3. Leave the jars for about 5 minutes and then remove the covers. Use a thermometer to measure the temperatures of each of the jar's contents and record your results. Place the covers back after taking the readings.
4. Repeat step 4 every five minutes for about 25 minutes or until the water becomes to cool to have any significant effect on the experiment results. Record your results in a chart.
5. The jug with the warmest water had the best insulator as a cover!
Subscribe to:
Posts (Atom)