Upload
noel-arnold
View
218
Download
0
Tags:
Embed Size (px)
Citation preview
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