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

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 

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/

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 . 

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.

REVISION NOTES FOR UNIT 3 (3.1)

TYPES OF MAGNETS

*Introduction to magnets 

http://www.slideshare.net/perfectyt123/magnets#btnNext

* Power of a magnet

http://www.slideshare.net/perfectyt123/power-of-a-magnet

 

REVISION NOTES FOR UNIT 2 (2.3)

PLANTS CAN BE GROUPED IN MANY WAYS

REVISION NOTES FOR UNIT 2 (2.2)

GROUPING PLANTS ACCORDING TO THEIR EXTERNAL FEATURES

 

MORE  EXAMPLE ABOUT EXTERNAL FEATURES OF PLANTS

http://www.slideshare.net/rajaswaryganaeson/external-features-of-plant#btnNext

REVISION NOTES FOR UNIT 2 (2.1)

THE EXTERNAL FEATURES OF PLANTS

REVISION NOTES FOR UNIT 1 (1.3)

ANIMALS CAN BE GROUPED IN MANY WAYS

REVISION NOTES FOR UNIT 1 (1.2)

GROUPING ANIMALS ACCORDING TO THEIR EXTERNAL FEATURES

 

REVISION NOTES FOR UNIT 1 (1.1)

EXTERNAL FEATURES OF ANIMAL

*ANOTHER EXAMPLE ABOUT EXTERNAL FEATURES OF ANIMALS

http://www.slideshare.net/LohChuen/external-features-of-animals-10453374#btnNext

UNIT 3 ( LESSION 5 )

DIFFERENT USES OF MAGNETS

1. Magnets are used in our daily lives.

UNIT 3 ( LESSION 4 )

STRENGTH OF MAGNETS

1. Magnets differ in strength .

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

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

        

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  

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

UNIT 1 ( LESSION 3 )

Animals can be grouped in many ways
1.Animals have special external features that can be used to group them.

Other features to group animals

• Spines
• Antenna
• Shell
• Webbed feet
• Hooves

UNIT 1 ( LESSION 2 )

Animals can be grouped according to their external features
1.Animals can be grouped according to their similarities and differences in external features.

• wings - feathers , antenna
• scales - fins four legs
• webbed feet - four legs , two legs
• four legs - claws , horn 
• tail - hair , fur
• shell - no legs , more legs
  

UNIT 1 ANIMALS ( LESSION 1 )

External features of animals
1. Animals can be recognized by their external features.
2. Different animals have different external features. 

External features of animals
scales                   hoof
fins                       hair 
horn                     beak
leg                        fur
claws                   wing
feather                  tail