1. Sound Energy

2. What is sound? Sound is A form of energy made by vibrations.
When an object vibrates it causes the air particles around it to move.
These particles bump into particles close to them and this continues until they run out of energy.

3. Try this:
Put your finger on your neck and say “aah” as loud as you can.
Now say it as soft as you can.
You can not only hear the sound, but you can feel the vibration inside your throat.

4. How does sound travel?
Sound travels through all forms of matter— gases, liquids and solid.
These are called the medium.
Sound cannot travel through a vacuum.

5. What is pitch? Pitch is how high or how low a sound is.
This is a high pitched sound.
This is a low pitched sound.
Pitch is how high or how low a sound is.
This is a high pitched sound.
This is a low pitched sound.

6. How does sound travel?
Sound passes through the medium as longitudinal waves.
When the vibrations are fast you hear a high pitch. When they’re slow, you hear a low pitch.
High Pitch
Low Pitch

7. How else can we change sound?
We can make it louder or softer by changing the amplitude of the height of the wave.
The higher the amplitude, the louder the sound. The lower the amplitude the softer the sound.
Louder
Softer

8. How do musical instruments create sound?
It depends on the type of instrument. There are four types.
Woodwind
String
Percussion
Brass

9. Woodwinds Instruments
Woodwinds make music by blowing on the top of the instrument or on a reed.
Bassoon
Oboe
Flute
Clarinet
Piccolo

10. String Instruments
Strings make music by plucking or strumming the strings.
Harp
Guitar
Violin
Electric Guitar
Cello

11. Percussion Instruments
Percussion instruments make music by striking, shaking or scraping them.
Piano
Tambourine
Drum
Cymbals
Maracas
Xylophone

12. Brass Instruments
Brass instruments make music by buzzing lips while blowing.
Trombone
French Horn
Tuba
Trumpet

13. Did you know?
Sound travels 4 times faster through water than through air.
There is no sound in space.
Geologists use their knowledge of how sound travels through rocks to help them find oil fields.