conservation of energy lab - montgomery county public schools能源实验室保存的蒙哥马利县公立学校

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1、ConservationofEnergyLabName_____________________Pd______LabPartners:_______________________________________________________________Purpose:Inthisexperiment,thelawofconservationofenergywillbeinvestigatedbycomparingthestartingpotentialenergyofapendulumtoitskineticenergyasitswingsthroughitslo

2、west(equilibriumposition)point.TestableQuestion:Doesthekineticenergyofapendulumatthebottomofitsswingequalthechangeinitspotentialenergyfromitsdropposition?Materials:1200gstandardmass1meterstick2C-clamps1lengthofstringatleast0.5mlongapprox.8meteroftickertapemaskingtape1meterstickringstandPro

3、cedure:1.Measurethemassofapendulumbobandrecordinthedatachart.2.Assumethatthespacebetweenanytwotickertapedotstakes1/60thofasecondtocreate3.Attachtheendofthetapetothependulumbob,asshownintheillustration.Carbondisk200gmassTickertapeWithNOSLACKRingstandTickertimer4.Measuretheheightthatthependu

4、lumbobisabovethetable(notabovetheringstandbase)whenthependulumisinitsverticalequilibriumposition.5.Displacethependulumtoonesideuntiltheverticaldistancebetweenthependulumandthetableishigherthanitwasattheequilibriumposition6.Measurethependulumbob’snewheightabovethetabletop,startthetimerandre

5、leasethependulum.7.Whenthependulumhasswungovertotheothersideandisjuststartingbackdown,stopthependulumandthetickertimerandexaminethetape.8.Findthelargestspaceonthetapeandmeasureit.1.Convertthedistancemeasurementtometersandcalculatethemaximumspeedthatthependulumachievedduringitsswingbydividi

6、ngthedistancebythetimethatisassociatedwithasingleintervalonthepaper(time/space=1/60thsecond).KE=½mv22.Usingthespeedcalculatedinthepreviousstep,calculatethemaximumkineticenergyofthependulumusingtherelationship:3.Repeattheaboveprocedure,raisingthependulumbobtofourotherdifferentheights.4.Calc

7、ulatethepotentialenergyofthebobbeforeitstarteditsswingbyusing:5.ComparetheinitialPEforeachswingtothefinalmaximumKEforeachswingbycalculatingthe%differenceforeachtrial,usingthePEasthetruerofthetwovalues.SuggestionsandTechniques:·Useapendulumthatisatleast0.5meter