1. Science
TOPIC :

2. SOUND Listen to the clock ticking.
Hold one end ot the wood dowel against the face of the clock.
Hold the other end of the dowel against the bone in front of your ear.
Describe what you experience.
Repeat this with the metal rod.
Compare the sounds through wood and metal. Which transmits sound better?

3. How is Sound Made? Sounds are made by vibration.
When something vibrates it creates waves that pass through the air.
Musical instruments make sounds by striking, blowing, plucking or by playing with a bow.
Some sounds are created electronically.

4. What happens when we hear a sound?
An object like a violin vibrates the air, and those vibrations travel from the violin through the air until they reach us.
But we don't hear a violin with our noses or our elbows!
These vibrations need to travel into our ears for us to really hear them.

5. Here’s how sound works The ear is naturally designed to : Collect
Focus and
Transmit sounds to the Brain.

6. Percussion Instruments
What Is Music?
What is the difference between musical sound and noise?
Noise results when irregular vibrations are made at irregular times.
Musical sound results when regular vibrations of the voice or a musical instrument are produced.
There are three main kinds of musical instruments:
String instruments
Wind Instruments
Percussion Instruments

7. String Instruments
String instruments have strings stretched over a box or board.
Sound is made by plucking the strings.
The pitch of these instruments depends on the length, thickness and tightness of the strings.
Tight, thin strings make sounds with high tones.
Loose, thick strings make lower tones.
Examples of String Instruments.

8. Wind Instruments
Have you ever blown a whistle or have blown across the top of an open bottle to make sounds?
In wind instruments, air is blown through small openings into a tube or pipe.
The stream of air (air column) in the instrument vibrates.
Examples of Wind Instruments.

9. Percussion Instruments
If you stretch a material tightly across a tube and hit it, it will vibrate.
This is the basis of the drum or tambourine.
Examples of Percussion Instruments.

10. Let’s try this activity!
We learned that sound is produced by vibrating objects.
Materials:
tuning fork, glass of water, hair pin, empty soup can, soda bottle, vocal cords
Procedures:
Do each experiment and write down what you learn.
Strike a tuning fork. While it is still humming put it into a glass of water.
Straighten a bobby pin. Hold it against an inverted empty can while you strum the end of the bobby pin.
Touch your throat and then hum a low note.

11. Examples of String Instruments
Violin
guitar
banjo

12. Examples of Wind Instruments
whistle
trumpet
flute

13. Examples of Percussion Instruments
Drums
tambourines
gulintangan
cymbals
gongs