Rotasjon


Kule roterer rundt sin eigen akse.

Rotasjon eller dreierørsle syner særskilt til rørsla til ein stiv lekam rundt eit punkt eller ein akse. I matematikken blir rotasjon definert som ei rørsle der alle faste punkt i ein fast lekamar blir verande i ein fast avstand frå eit visst punkt. Dersom aksen eller punktet eit objekt roterer rundt er inne i objektet, seier ein at det roterer om seg sjølv eller at det spinn.


Døme på gjenstandar som er utforma til å rotere er hjul, propell, svinghjul og rotor. Eit objekt kan rotera i høve til andre objekt ved hjelp av ein eller fleire hengsler, til dømes dører og sakser.


Rotasjonen vert målt som ein vinkelfrekvens, med eining radianar per sekund [rad/s], men andre einingar er òg i bruk:


  • Omdreiingar per sekund [o/s].

  • Omdreiingar per minutt [o/min]. Denne eininga er vanleg for motorar og andre maskinar.

    Spire Denne fysikkartikkelen er ei spire. Du kan hjelpe Nynorsk Wikipedia gjennom å utvide han.



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