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ID:45748533
大小:59.49 KB
页数:9页
时间:2019-11-17
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1、BankedCurvesForceonaCurveAvehicleonacurvedtrackhasacentripetalaccelerationassociatedwiththechangingdirection.Thecurvedoesn5thavetobeacompletecircle.•Thereisstillaradius(r)associatedwiththecurve•TheforceisstillFc=mv^/rdirectedinwardpushesatthepointofcontact.AccelerationofthecontactpointThegroun
2、dpushesback,acceleratingthecar.FrictiononaWheelArollingwheeldoesnotslip.Itexhibitsstaticfriction.AsacaracceleratesthetirePointincontactdoesn5tslipCurvesandFrictionOnaturntheforceofstaticfrictionprovidesthecentripetalacceleration.Intheforcediagramthereisnootherforceactinginthecentripetaldirecti
3、on.Fr=mv2/rJFc=FfSkidding題Thelimitofsteeringinacurveoccurswhenthecentripetalaccelerationequalsthemaximumstaticfriction.Fc=mv:e=Ff=^smgAcurveonadryroad(虫=1.0)issafeataspeedof90km/h.Whatisthesafespeedonthesamecurvewithice(应=0.2)?•90km/h=25m/s•//H9=64m•v2icy=^sgr=^20m2/s2•vicy=11m/s=40km/hBanking
4、yCurvesintendedforhigherspeedsarebanked・Withoutfrictionacurvebankedatanangle0cansupplyacentripetalforceFc=mgtan8anyfriction.ThecarcanturnwithoutUsingNormalForce>Acaronacurveusesbothnormalforcefrombankingandstaticfrictionfromthetirestosteerthecurve.Fc=Fnsin&+耳2rnvmax/r=mgtanO+/Jsmg=J(化+tan&)g厂
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