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TRANSCRIPT
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Revolution
3/3/17
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DONOW– HWonDesk!• 1.Whatistheearth’saxis?• 2.Howlongdoesittaketheearthtorotateonceonitsaxis?• 3.Whatarethethreedifferenttypesofgalaxies?Inwhattypeofgalaxyisoursolarsystemlocated?• 4.Whatisthedifferencebetweentheheliocentricandgeocentrictheories?Whichtheorycorrectlydescribesoursolarsystem?
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Observations• BothpicturesshowhowtheEarthmoves– whatisdifferentabouthowtheearthismoving?
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Remember– EarthROTATESonitsaxis
• Ittakesearth24hours(oneday)todothis• Thesidefacingthesunexperiencesday;thesidefacingawayfromthesunexperiencesnight.
http://www.youtube.com/watch?v=y6Y2zM3ThdI&safety_mode=true&persist_safety_mode=1
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CheckforUnderstanding
• 1.Ittakes24hoursforearthtorotateonitsaxis.ThisishowwetimeONEDAY.–HOWWOULDtheLENGTHofthedaychangeiftheearthmovedmoreslowly onitsaxis?–Whatiftheearthmovedmorequickly?
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Revolution
• Revolution:Themovementofoneobjectaroundanother.• Earthrevolves,(moves,around)thesun.• Ittakes365daystodothis.
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EarthRevolvesaroundtheSuninitsorbit
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Demo• Standanddemo:Revolutionvs.Rotation• Thinkofyourown!– Inyourguidedpractice,jotdownsomenotesabout
• Istheskaterinthefirstvideorevolvingorrotating?Explainwhy.– https://www.youtube.com/watch?v=0oStQg4kNMA
• Aretheathletesinthesecondvideorevolvingorrotating?Explainwhy.– http://www.youtube.com/watch?v=IQIOyVQPd3I&feature=relmfu (startvideoat4:30)
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IfoneROTATIONcausesdayandnight,whatdoesoneREVOLUTIONcause?
• 1EarthYear=1Revolutionaroundthesun
• That1RevolutioncausestheSeasons!
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TheSeasons- Demo• Earthistilted onitsaxis
• AstheEarthmovesaroundthesundifferentareasareclosertothesun’sheat
• Thatiswhywegetdifferentweatheratdifferenttimesoftheyear
• ThisisalsowhyyouhaveoppositeweatherNorthandSouthoftheequator.
Thepartoftheearththatisclosesttotherunisexperiencingsummer
CFU:Whatseasonisitwheretheredstarisintheearthabove??
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Whatdoyounoticeabouthowtheearthismoving?
• http://www.classzone.com/books/earth_science/terc/content/visualizations/es0408/es0408page01.cfm
• Bothmovementshappenatthesametime!
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CheckforUnderstanding
• 1.Ittakes365daysforearthtorevolvearoundthesun.ThisishowwetimeONEYEAR–HOWWOULDtheLENGTHoftheyearchangeiftheearthmovedmoreslowlyaroundthesun?
–Whatiftheearthmovedmorequickly?
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SimonSays….RevolutionorRotation?
• Standsilentlyandpushchairin.
• FollowtherulesforSimonSays
• Youwillhavetoeitherrotateorrevolve.
• Mixedthemup?!Mustsitdownuntilthenextround.
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SummarizingEarth’sRevolutionandRotation
RevolutionoftheEarth
RotationoftheEarth
Definition EarthorbitingaroundtheSUN
Earthspinningonitsaxis(imaginarylinegoingdownthecenter)
Howlongdoesittake?
365days(1year) 24hours(1 day)
Whatdoesitcause?
Winter,Fall,Spring,Summer(dependingontheearthstiltandpositionaroundthesun)
DayandNight(dependingonwhichsideoftheearth isfacingthesun)
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SimonSays….RevolutionorRotation?
• Standsilentlyandpushchairin.
• FollowtherulesforSimonSays
• Youwillhavetoeitherrotateorrevolve.
• Mixedthemup?!Mustsitdownuntilthenextround.
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Practice!
• Isaballerinaspinninganexampleofrotationorrevolution?
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Practice
• Isthisanexampleofrotationorrevolution?
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Practice
• Isthisanexampleofrotationorrevolution?
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Practice
• Doesthemerrygoroundrevolveorrotate?
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Practice
• Isthisanexampleofrotationorrevolution?
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Practice
• Isthisanexampleofrotationorrevolution?
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Practice
• Isthisanexampleofrotationorrevolution?
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Practice
• Isthisanexampleofrotationorrevolution?
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Practice
• Isthisanexampleofrotationorrevolution?
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QuestionsforReview
1. AroundwhatdoesEarthrotate?2. AroundwhatdoesEarthrevolve?
3. IfEarth’srotationslowed,whatwouldhappentothelengthofadayonEarth?
4. IfEarthrevolvedaroundthesunfaster,whatwouldhappentothelengthofayearonEarth?
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Last5
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