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toth42

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Siden ungdomsskolen har jeg alltid gÄtt med oppfatningen av at tyngdekraften virker likt pÄ alt. Ja, man har luftmotstand og slikt, men la oss snakke vakuum;
Jeg mener Ä huske vi lÊrte om Galileo Galilei, som fant ut at alt faller like fort, nÄr ingen andre krefter pÄvirker fallet, altsÄ i vakuum.

Men jeg er i en diskusjon pÄ diskusjon.no, hvor det pÄstÄs av skarpere folk enn meg, at et objekt stÞrre enn et annet vil falle fortere, da gravitasjonen har mer masse Ä "ta tak i". Noe som forÞvrig hÞres logisk ut.

SpÞrsmÄlet: Husker jeg feil? Vil denne kula O lande fÞr denne o , sluppet fra samme hÞyde i vakuum?
Og isÄfall, hva var det Galielei faktisk fant ut?


http://www.diskusjon.no/index.php?showtopic=656836&st=20

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InnleggSkrevet: Man 06 Nov 2006, 09:24
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Asfrith

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Galileo var en smart mann. Teorien hans gikk ut pÄ at hvis man fjernet alle andre pÄvirkningskrefter enn gravitasjonen, sÄ ville to objekter med lik vekt falle til jorden like raskt, uavhengig av fysisk form. Han prÞvde Ä gjennomfÞre dette forsÞket selv, ved Ä slippe et kilo fjÊr pakket tett sammen, og en jernkule pÄ ett kilo, samtidig fra toppen av det Skjeve TÄrn i Pisa, men konkluderte med at luftmotstanden og vind Þdela for forsÞkene hans. Teorien ble likevel stÄende. I 1971 ble den endelig bevist da mannskapet pÄ Apollo 17 (tror jeg) prÞvde det samme forsÞket pÄ mÄnen.

Hvor stor fysisk utstrekning en gjenstand har, spiller ingen rolle for gravitasjonen. I sÄ fall ville badeballer falt til jorden mye raskere enn for eksempel en fiskesluk, selv om de veier omtrent det samme. Det er kun vekta (eller mer korrekt massen) som har innvirkning pÄ hvor raskt et objekt faller til jorden.

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InnleggSkrevet: Man 06 Nov 2006, 09:42
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Glahn

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Tar du bort ytre pÄvirkningsfaktorer som luftmotstanden, vil f.eks en fjÊr og en ambolt falle like raskt mot bakken. De trenger ikke ha lik vekt/masse engang. Tro meg - dette er testa i praksis mange ganger.

Grunnen til dette er enkel - reaksjon og motreaksjon. Fysikkens lover sier enkelt sagt at reaksjon og motreaksjon alltid vil vÊre like store i forhold til hverandre. NÄr jorda trekker i et objekt trekker det altsÄ i objektet med en kraft som er proporsjonal med objektets masse. Man skulle derfor tro at ambolten vil falle raskere fordi jorda trekker pÄ den med stÞrre kraft enn pÄ fjÊra. Men da glemmer man noe viktig: Forholdet mellom styrken i reaksjon og motreaksjon er den samme for bÄde ambolten og fjÊra, og de ender opp med Ä falle med samme hastighet.

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InnleggSkrevet: Man 06 Nov 2006, 10:45
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Glahn

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Det var forresten ogsÄ dette Gallilei, den geniale mannen, tenkte seg frem til helt pÄ egenhÄnd. Det jeg har hÞrt er at han testa teorien ved Ä slippe lodd av forskjellig vekt fra det skjeve tÄrnet i Pisa.

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InnleggSkrevet: Man 06 Nov 2006, 10:50
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Glahn

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Du kan ogsÄ se det pÄ denne mÄten: Jorda trekker pÄ ambolten med stÞrre kraft, ja. Men objekter endrer ikke retning/begynner ikke Ä bevege seg uten ganske mye overtalelse, og jo stÞrre masse et objekt har, jo mer overtalelse trenger det. Overtalelsesmengden vil alltid vÊre den samme i forhold til stÞrrelsen pÄ massen, og slutthastigheten/aksellerasjonen blir dermed alltid den samme for alle objekter.

En annen effekt av dette er at man f.eks veier 6 ganger mindre pÄ mÄnen fordi mÄnen trekker i deg med en kraft som er 6 ganger mindre enn pÄ jorda. Du kan derfor lett plukke opp et annet menneske fra bakken, men Ä riste dette mennesket frem og tilbake vil vÊre like hardt pÄ mÄnen som pÄ jorda. Dette fordi at kraften som skal til for Ä fÄ mennesket til Ä endre retning stadig er den samme, fordi massen til mennesket er den samme pÄ mÄnen som pÄ jorda.

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InnleggSkrevet: Man 06 Nov 2006, 10:59
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toth42

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HĂžres ut som meg og deg er enige, Glahn.. Men vil motreaksjon ha effekt i fritt fall i vakum?

Jeg siterte deg forÞvrig pÄ diskusjon.no, sÄ fÄr vi se hva slags svar vi fÄr..

http://www.diskusjon.no/index.php?act=ST&f=182&t=656836&st=20#entry7227894

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InnleggSkrevet: Man 06 Nov 2006, 11:35
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Glahn

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Vakuumet er nettopp det som fjerner alle andre ytre faktorer som har pÄvirkning i sÊrlig grad - nemlig luftmotstanden. Tyngdekraften og fysikkens lover gjelder uavhengig om det er vakuum eller ikke Smile

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InnleggSkrevet: Man 06 Nov 2006, 11:53
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toth42

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Jeg begynner Ä fÄ folk pÄ mitt lag nÄ.. Razz

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InnleggSkrevet: Man 06 Nov 2006, 13:52
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Glahn

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Godt Ă„ hĂžre, og takk for skarp beskrivelse Smile

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InnleggSkrevet: Man 06 Nov 2006, 18:16
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toth42

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Ser ut til at det hele er gigantisk misforstÄelse, gitt.. Alle er visst enige om at alt faller like fort i vakuum, vi var bare ikke enige om hva vi diskuterte.. Razz

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InnleggSkrevet: Tir 07 Nov 2006, 10:31
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bikerkids_88

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et av forsÞkene GG gjorde, var Ä slippe en kule av bly, og en kule av et lettere stoff som var nÞyaktig like glatte, og nÞyaktig like store. Ergo, samme luftmotstand. Dette slapp han ut fra det skjeve tÄrn i pisa, og de landet samtidig pÄ bakken.

ergo, vekt og masse har ingen betydning for gravitasjonen, men har betydning for luftmotstanden.

prÞv selv, med en lett og liten ting, og en stÞrre og tyngre ting. den lille lander fÞrst pÄ bakken. hvis det er vindstille riktignok, fordi lette ting blir lettere tatt opp av vinden.

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InnleggSkrevet: Fre 06 Apr 2007, 22:57
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Justin Case

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her har de bevist dette en gang for alle (tror jeg)
http://www.youtube.com/watch?v=5C5_dOEyAfk
siden det pÄ mÄnen ikke er luft...

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InnleggSkrevet: Fre 06 Apr 2007, 23:19
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