Revolution

3/3/17

DONOW– HWonDesk!• 1.Whatistheearth’saxis?• 2.Howlongdoesittaketheearthtorotateonceonitsaxis?• 3.Whatarethethreedifferenttypesofgalaxies?Inwhattypeofgalaxyisoursolarsystemlocated?• 4.Whatisthedifferencebetweentheheliocentricandgeocentrictheories?Whichtheorycorrectlydescribesoursolarsystem?

Observations• BothpicturesshowhowtheEarthmoves– whatisdifferentabouthowtheearthismoving?

Remember– EarthROTATESonitsaxis

• Ittakesearth24hours(oneday)todothis• Thesidefacingthesunexperiencesday;thesidefacingawayfromthesunexperiencesnight.

http://www.youtube.com/watch?v=y6Y2zM3ThdI&safety_mode=true&persist_safety_mode=1

CheckforUnderstanding

• 1.Ittakes24hoursforearthtorotateonitsaxis.ThisishowwetimeONEDAY.–HOWWOULDtheLENGTHofthedaychangeiftheearthmovedmoreslowly onitsaxis?–Whatiftheearthmovedmorequickly?

Revolution

• Revolution:Themovementofoneobjectaroundanother.• Earthrevolves,(moves,around)thesun.• Ittakes365daystodothis.

EarthRevolvesaroundtheSuninitsorbit

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)

IfoneROTATIONcausesdayandnight,whatdoesoneREVOLUTIONcause?

• 1EarthYear=1Revolutionaroundthesun

• That1RevolutioncausestheSeasons!

TheSeasons- Demo• Earthistilted onitsaxis

• AstheEarthmovesaroundthesundifferentareasareclosertothesun’sheat

• Thatiswhywegetdifferentweatheratdifferenttimesoftheyear

• ThisisalsowhyyouhaveoppositeweatherNorthandSouthoftheequator.

Thepartoftheearththatisclosesttotherunisexperiencingsummer

CFU:Whatseasonisitwheretheredstarisintheearthabove??

Whatdoyounoticeabouthowtheearthismoving?

• http://www.classzone.com/books/earth_science/terc/content/visualizations/es0408/es0408page01.cfm

• Bothmovementshappenatthesametime!

CheckforUnderstanding

• 1.Ittakes365daysforearthtorevolvearoundthesun.ThisishowwetimeONEYEAR–HOWWOULDtheLENGTHoftheyearchangeiftheearthmovedmoreslowlyaroundthesun?

–Whatiftheearthmovedmorequickly?

SimonSays….RevolutionorRotation?

• Standsilentlyandpushchairin.

• FollowtherulesforSimonSays

• Youwillhavetoeitherrotateorrevolve.

• Mixedthemup?!Mustsitdownuntilthenextround.

SummarizingEarth’sRevolutionandRotation

RevolutionoftheEarth

RotationoftheEarth

Definition EarthorbitingaroundtheSUN

Earthspinningonitsaxis(imaginarylinegoingdownthecenter)

Howlongdoesittake?

365days(1year) 24hours(1 day)

Whatdoesitcause?

Winter,Fall,Spring,Summer(dependingontheearthstiltandpositionaroundthesun)

DayandNight(dependingonwhichsideoftheearth isfacingthesun)

SimonSays….RevolutionorRotation?

• Standsilentlyandpushchairin.

• FollowtherulesforSimonSays

• Youwillhavetoeitherrotateorrevolve.

• Mixedthemup?!Mustsitdownuntilthenextround.

Practice!

• Isaballerinaspinninganexampleofrotationorrevolution?

Practice

• Isthisanexampleofrotationorrevolution?

Practice

• Isthisanexampleofrotationorrevolution?

Practice

• Doesthemerrygoroundrevolveorrotate?

Practice

• Isthisanexampleofrotationorrevolution?

Practice

• Isthisanexampleofrotationorrevolution?

Practice

• Isthisanexampleofrotationorrevolution?

Practice

• Isthisanexampleofrotationorrevolution?

Practice

• Isthisanexampleofrotationorrevolution?

QuestionsforReview

1. AroundwhatdoesEarthrotate?2. AroundwhatdoesEarthrevolve?

3. IfEarth’srotationslowed,whatwouldhappentothelengthofadayonEarth?

4. IfEarthrevolvedaroundthesunfaster,whatwouldhappentothelengthofayearonEarth?

Last5

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