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