.实用文档..HYPERLINK"://grc.nasa.gov/WWW/K-12/airplane/newton1g.html"+TextOnlySiteHYPERLINK"://grc.nasa.gov/WWW/K-12/airplane/newton1g.html"+Non-FlashVersionHYPERLINK"://nasa.gov/centers/glenn/about/contact_us.html"\t"_blank"+ContactGlennThispageisintendedforcollege,highschool,ormiddleschoolstudents.Foryoungerstudents,asimplerexplanationoftheinformationonthispageisavailableonthe HYPERLINK"://grc.nasa.gov/WWW/K-12/UEET/StudentSite/dynamicsofflight.html"\l"lawofmotion"KidsPage.SirIsaacNewtonfirstpresentedhisthree HYPERLINK"://grc.nasa.gov/WWW/K-12/airplane/newton.html"lawsofmotion inthe"PrincipiaMathematicaPhilosophiaeNaturalis"in1686.Hisfirstlawstatesthateveryobjectwillremainatrestorinuniformmotioninastraightlineunlesscompelledtochangeitsstatebytheactionofanexternalforce.Thisisnormallytakenasthedefinitionof inertia.Thekeypointhereisthatifthereis nonetforce resultingfromunbalancedforcesactingonanobject(ifalltheexternalforcescanceleachotherout),thentheobjectwillmaintaina constantvelocity.Ifthatvelocityiszero,thentheobjectremainsatrest.Andifanadditionalexternalforceisapplied,thevelocitywillchangebecauseoftheforce.TheamountofthechangeinvelocityisdeterminedbyNewton's HYPERLINK"://grc.nasa.gov/WWW/K-12/airplane/newton2.html"secondlaw ofmotion.TherearemanyexcellentexamplesofNewton'sfirstlawinvolvingaerodynamics.Themotionofan HYPERLINK"://grc.nasa.gov/WWW/K-12/airplane/newton1.html"airplane whenthepilotchangesthethrottlesettingoftheengineisdescribedbythefirstlaw.Themotionofa HYPERLINK"://grc.nasa.gov/WWW/K-12/airplane/newton1a.html"ball fallingdownthroughtheatmosphere,ora HYPERLINK"://grc.nasa.gov/WWW/K-12/airplane/newton1r.html"modelrocket beinglaunchedupintotheatmospherearebothexamplesofNewton'sfirstlaw.Themotionofa HYPERLINK"://grc.nasa.gov/WWW/K-12/airplane/newton1k.html"kite whenthewindchangescanalsobedescribedbythefirstlaw.Wehavecreatedseparatepageswhichdescribeeachoftheseexamplesinmoredetailtohelpyouunderstandthisimportantphysicalprinciple.
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