Monday, 24 December 2012

UNIT 5 ( LESSION 3 )

USES OF SPRINGS

1. Springs are used a lot in our daily lives.
2. Springs are used in tools and equipment , electrical appliances, stationery and toys. 
For example : 




playground horse









 battery holder








     


 shock absorber











  stapler

Sunday, 23 December 2012

UNIT 5 ( LESSION 2)

SPRINGS STRETCH DIFFERENTLY

1. Springs have different sizes and shapes.
2. Different springs streth differently.
3. A long spring stretches more than short spring.
4. A spring with a larger diameter stretches more than a spring with a smaller diameter.
5. Aspring made of thin wire stretches more than a spring made of thick wire.

Springs that stretch more = thin wire spring , big diameter spring , long spring

Springs that stretch less = thick wire spring , small diameter spring , short spring 

Saturday, 22 December 2012

UNIT 5 SPRINGS ( LESSION 1 )

SPRINGS RETURN TO ITS ORIGINAL SIZE AND SHAPE

1. A spring changes its size, shape and length when it is twisted, stretched or squeezed.
2. When a spring is released, it returns to its original size and shape.

*Introduction about twist, stretch , bend and squeeze.  

http://ppdhl.net/courseware/ScienceY3/cd3/lesson/main/

Thursday, 20 December 2012

UNIT 4 ( LESSION 2 )

MATERIALS THAT CONDUCT ELECTRICITY

1. Materials that allow electricity to flow throught them are called conductors.
2. Materials that do not allow electricity to flow through them are called non- conductors.
3. Non - conductors cannot complete a circuit.
4. Conductors can be used to complete a circuit.

CONDUCTORS

paper clip , metal ruler , pencil lead , tin can , coin , key .

NON-CONDUCTORS
wooden ruler , eraser , pen , cloth , candle , marble . 

Tuesday, 18 December 2012

UNIT 4 ELECTRICITY(LESSION 1)

1. The objects below can be used to make a complete circuit.
    ~ battery , connecting wires , bulb holder , bulb .
2. A complete circuit makes the bulb light up.
3. The bulb lights up brighter when a battery is added to the circuit. This is because more electricity flows through   the circuit.
4. The bulb lights up dimmer when a battery is removed from the circuit.
5. More batteries will make a bulb light up brighter. More bulb and longer wires will make a bulb light up dimmer.

Thursday, 13 December 2012

Saturday, 8 December 2012

Friday, 7 December 2012

Thursday, 6 December 2012

UNIT 3 ( LESSION 3 )

Materials attracted by magnets

1. Magnetic objects are attracted by magnets.
2. Non-magnetic objects are not attracted by magnets.

Magnetic objects
* One sen coin          * Thumbtack           * Iron nail                * Needle
* Steel spoon             * Clip                       * Spring                    * Screw

Non- magnetic objects
* Ten sen coin          * Copper wire           * Aluminium              * Silver ring
* Stone                     * Chalk                      * Glass                       * Plastic

Wednesday, 5 December 2012

UNIT 3 ( LESSION 2 )

Handling magnets

1. Incorrect ways of handling magnets:
  • Heating a magnet
  • Dropping a magnet
  • Knocking a magnet
2. Heating , dropping and knocking a magnet will weaken a magnet.
3. Correct ways of handling magnets :    
  • Hold the magnet firmly
  • Keep magnets in the box
  • Use metal to connect the ends of magnets
        

Tuesday, 4 December 2012

UNIT 3 MAGNETS ( LESSION 1 )

Magnets attract or repel each other
1. Magnets are of different sizes and shapes.

    Types of  magnets : a ) U - shaped
                                     b ) Horseshoe
                                     c ) Bar
                                     d ) Ring
                                     e ) Rod
                                     f  ) Circle

2. A magnet has a north pole( N ) and a south pole ( S ).
3. Magnets will repel each other if the poles are the same. Magnets will attract each other if the poles are  different.

UNIT 2 ( LESSION 3 )

Plants can be grouping in many ways

1. Plants can be grouped in many ways according to their similarities and differences in external features.

Grouping of plants
  • Bark  ~ smooth , rough
  • Fruit ~ presence , absence
  • Flower ~ presence , absence
  • Root ~ tap root , fibrous root
  • Stem ~ soft stem , woody stem
  • Leaves ~ colour , shape , size

UNIT 2 ( LESSION 2 )

Plants can be grouped according to their external features

1. Plants have similarities and also differences based on their external features.

 Grouping of plants
a ) Flower
  • Flowering   = Rose , orchid , Hibiscus
  • Non- flowering = Fern , Moss , Mushroom 
b ) Stem 
  • Woody stem = Durian, Hibiscus , Mango

  • Soft stem = Banana , Sunflower , Balsam  



Monday, 3 December 2012

UNIT 2 PLANTS ( LESSION 1 )

External features of plants

1. Plants can be recognised by their external features.
2. Differents plants have differents external features. These include type of stem, flowering or   non-flowering, type of leaf surface and shape of leaves.

Stem
  • Woody stem =  Mango tree
  • Soft stem = Banana plant
Flower
  • Flowering = Paddy plant
  • Non-flowering = Fern
Leaves
  • Shiny and smooth = Banana plant
  • Dull and rough = Pumpkin plant
Leaves
  • Irregular = Fern
  • Long leaves = Banana plant
  • Oval leaves = Bougainvillea