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newtonsecondlaw(thehistoryandtheprocedure)shouldbeinenglish
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更新时间:2024-03-28
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newtonsecondlaw(thehistoryandtheprocedure)shouldbeinenglish

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  Newton'sSecondLaw   Newton'sfirstlawofmotionpredictsthebehaviorofobjectsforwhichallexistingforcesarebalanced.Thefirstlaw-sometimesreferredtoasthelawofinertia-statesthatiftheforcesactinguponanobjectarebalanced,thentheaccelerationofthatobjectwillbe0m/s/s.Objectsatequilibrium(theconditioninwhichallforcesbalance)willnotaccelerate.AccordingtoNewton,anobjectwillonlyaccelerateifthereisanetorunbalancedforceactinguponit.Thepresenceofanunbalancedforcewillaccelerateanobject-changingeitheritsspeed,itsdirection,orbothitsspeedanddirection.   Newton'ssecondlawofmotionpertainstothebehaviorofobjectsforwhichallexistingforcesarenotbalanced.Thesecondlawstatesthattheaccelerationofanobjectisdependentupontwovariables-thenetforceactingupontheobjectandthemassoftheobject.Theaccelerationofanobjectdependsdirectlyuponthenetforceactingupontheobject,andinverselyuponthemassoftheobject.Astheforceactinguponanobjectisincreased,theaccelerationoftheobjectisincreased.Asthemassofanobjectisincreased,theaccelerationoftheobjectisdecreased.   Newton'ssecondlawofmotioncanbeformallystatedasfollows:   Theaccelerationofanobjectasproducedbyanetforceisdirectlyproportionaltothemagnitudeofthenetforce,inthesamedirectionasthenetforce,andinverselyproportionaltothemassoftheobject.   Thisverbalstatementcanbeexpressedinequationformasfollows:   a=Fnet/m   Theaboveequationisoftenrearrangedtoamorefamiliarformasshownbelow.Thenetforceisequatedtotheproductofthemasstimestheacceleration.   Fnet=m*a   Inthisentirediscussion,theemphasishasbeenonthenetforce.Theaccelerationisdirectlyproportionaltothenetforce;thenetforceequalsmasstimesacceleration;theaccelerationinthesamedirectionasthenetforce;anaccelerationisproducedbyanetforce.TheNETFORCE.Itisimportanttorememberthisdistinction.Donotusethevalueofmerely"any'oleforce"intheaboveequation.Itisthenetforcewhichisrelatedtoacceleration.Asdiscussedinanearlierlesson,thenetforceisthevectorsumofalltheforces.Ifalltheindividualforcesactinguponanobjectareknown,thenthenetforcecanbedetermined.
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