What is Mach One Did you hear that SOUND Sound is a form of energy that travels in waves What makes Sound Vibration back and forth motion There can not be sound if there is not any vibration ID: 527552
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Slide1
Journal Question
What is
Mach One?Slide2
Did you hear that SOUND?
Sound is a form of energy
that travels in
waves.Slide3
What makes Sound?
Vibration: back and forth motion
There can not be sound if there is not any vibration
Most vibrations are too fast for you to see.Vibrations require energy—sound is a form of energy.Slide4
How does Sound Travel?
When something vibrates
molecules in the air crowd together
then spread apart, causing sound waves to travel away from the vibrating objectSlide5
What Forms of Matter can Sound Travel Through?
Gas:
Sound travels easily through gases
It travels about 1,129 feet per second through air. (That’s how fast it travels when you talk!)
Liquids: Sound travels through water about 4,794 feet per second. (Think of what ripples look like in the water and how they spread.)Solids:
Sound travels through a solid like wood at a rate of 12,620 feet per second. Sound travels fastest through solids!Sound cannot travel through a vacuum (a space that is “empty” of matter).Slide6
Sound Waves
Sound vibrations occur in waves that go out in every direction like a circle.
Sound waves are created by repeated patterns of molecules spreading apart and squeezing together
.
Sound carries energy!Slide7
Making and Hearing Sounds
Hearing Sound
Humans have two ears on opposite sides of their heads.
Each ear gathers sound waves on each side of your body.
There are two ways that humans hear sounds.
With your ears.
With your brain.Slide8
How do you hear sound?
1. Sound causes your eardrum to vibrate.
The eardrum vibrates differently for each
sound.
The bones of your ear begin to vibrate,
beginning with the hammer, moves to the anvil,
and finally the stirrup.
The sound energy passes to the inner ear.
This causes the fluid in the cochlea to move.
The nerves then carry the message to the
brain.
5.
Your brain then tells you what the sound is.Slide9
Ernst Mach (1838-1916)
Austrian physicist
Determined mathematical value for the speed of sound
Mach OneLast nameSpeed of sound through a mediumSlide10
Speed of Sound
340.29 m /
s
or ~ 761 mi/hVaries with altitudeLower temp = lower speedSlide11
Sound Barrier
Bell Aircraft Corp
X-1
Chuck YeagerSlide12
Speed of Sound
https://www.youtube.com/watch?v=pogWW6g7Zd4
http://www.telegraph.co.uk/technology/news/10235261/Inside-the-Hyperloop-the-pneumatic-travel-system-faster-than-the-speed-of-sound.html
http://www.cbsnews.com/news/navys-newest-weapon-kills-at-seven-times-the-speed-of-sound/
https://www.youtube.com/watch?v=mUiy6PVND80#https://www.youtube.com/watch?v=mUiy6PVND80
https://www.youtube.com/watch?v=mUiy6PVND80#https://www.youtube.com/watch?v=mUiy6PVND80http://www.huffingtonpost.com/2014/10/24/alan-eustace-record-jump_n_6044598.htmlSlide13
Airfoil
Construct a graphic organizer as shown