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?

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.

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.

Here’s how sound works

The ear is naturally designed to :

• Collect

• Focus and

• Transmit sounds to the Brain.

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

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.

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.

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.

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.

1. Strike a tuning fork. While it is still humming put it into a glass of water.

2. Straighten a bobby pin. Hold it against an inverted empty can while you strum the end of the bobby pin.

3. Touch your throat and then hum a low note.

Examples of String Instruments

Violin guitar banjo

Examples of Wind Instruments

whistle trumpet

flute

Examples of Percussion Instruments

Drums

cymbals gongs

tambourines

gulintangan