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 Sound…5th grade  (teach)
 

Sound…5th grade (teach)

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Touches on some of the basic sound ideas at about the sixth grade level. Uses some home videos to demonstrate points.

Touches on some of the basic sound ideas at about the sixth grade level. Uses some home videos to demonstrate points.

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     Sound…5th grade  (teach) Sound…5th grade (teach) Presentation Transcript

    • Must download/save to see the videos/animations By Moira Whitehouse PhD
    • SOUND IS A FORM OF ENERGY CAUSED BYSOMETHING VIBRATING.
    • SOUND IS A FORM OF ENERGYTHAT YOU CAN HEAR CAUSED BY SOMETHING VIBRATING
    • A FORM OF WHAT?? ENERGYCAUSED BY WHAT?? VIBRATIONS
    • WATCH THE SALT BOUNCE AROUND AS THE SOUND WAVES FROM THE RADIOCAUSE THE STRETCHED RUBBER TO VIBRATE.
    • YOU SAW THE STRETCHEDRUBBER BOUNCED ABOUT BY THE SOUND VIBRATIONS. WE CALL THESE VIBRATIONS SOUND WAVES.
    • WE HEAR THE SOUND, WE SEE THE THUMB NAIL PIANO TINES BEING PLUCKED BUT THEVIBRATIONS ARE SO FAST THAT WE CAN NOT SEE THEM.
    • NOW WE WILL SEE THAT THE SOUND COMINGFROM A TUNING FORK IS ACTUALLY CAUSED BY VIBRATIONS.
    • SOUND VIBRATIONS, REMEMBER, AREALSO CALLED SOUND WAVES
    • NEXT WE OBSERVESOME CHIMES CHIMINGBUT WE SEE NOTHING VIBRATING.
    • WHAT IS VIBRATING INSIDETHOSE TUBES THAT MAKESTHE “BELL- LIKE” SOUND? THE ONLY THING IN THE TUBES WAS AIRIT MUST HAVE BEEN THE AIR VIBRATING
    • HERE WE STRIKE BOTTLES WITH DIFFERENT AMOUNTS OFWATER AND NOTE THE SOUND.
    • WAS THE AIR VIBRATINGTO MAKE THIS SOUND, OR WAS IT THE WATER? IT WAS THE WATER. WEKNOW, BEAUSE THE JARSWITH LESS WATER MADE THE HIGHER PITCHED SOUND.
    • AH, PITCHWHAT IS IT?
    • HIGH PITCH, LOWPITCH AND HOW LOUDA SOUND BECOMES, IS DETERMINED BY SOUND WAVES
    • SOUNDWAVELENGTH ISDETERMINED BYHOW FAST THESOURCE OF THE SOUND WAS VIBRATING.
    • THE MORE SOUND WAVESTHAT PASS BY YOUR EAR IN ONE SECOND THE HIGHER THE PITCH.
    • THE DISTANCE FROM ONE SOUND WAVE PEAK TO THENEXT IS THE WAVELENGTH OF A SOUND WAVE.
    • FAST VIBRATIONS GIVESHORT WAVELENGTHS MAKES HIGHER PITCH
    • SLOWER VIBRATIONS GIVELONGER WAVELENGTHS MAKES LOWER PITCH
    • HOW LOUD SOUND BECOMES ISDETERMINED BY HOW MUCH ENERGY IS IN THE SOUND WAVE.
    • THE DISTANCE FROM CREST TO A CREST SHOWSOR FROM THEA CREST ENERGY INTO A A SOUNDTROUGH WAVE
    • THE LESS ENERGY THE SOFTER OR QUIETER THE SOUND
    • THE MORE ENERGY THE LOUDER THE SOUND
    • MANY THINGS AFFECT PITCH. ON A GUITAR FOR EXAMPLE, PITCH IS AFFECTED BY THE THICKNESS OF THE VIBRATING STRING.
    • STRINGLENGTH ALSO AFFECTS PITCH
    • AND HOW TIGHT THE STRING ISAFFECTS PITCH.
    • IN THE NEXTLESSON WE WILL FIND OUT HOWSOUND TRAVELS.