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1、1.Complexmachinesaremadeupofmovingpartssuchasinclinedplanes,levers,gears,cams5cranks,Springs,belts,andwheels・复杂的机器是由运动部件组成,如倾斜面,杠杆,齿轮,凸轮,曲柄,弹簧,皮带和轮子。2.Aninclinedplanedecreasestheforcerequiredtoraiseanobjectagivenheightbyincreasingthedistanceoverwhichaforcemustbeap
2、plied・倾斜面通过增加在其上的力必须施加的距离,来减少提高物体的给定高度吋所需的力。3.Boththeinclinedplaneandleverscouldlowertheforcerequiredforataskatthepriceofhavingtoapplythatforceoveralongerdistanee.倾斜而和杠杠都可以应用更长距离上的力來降低完成一个任务所需的力。4.Pulleyscanbeusedtosimplychangethedirectionofanappliedforceortoprovi
3、deaforce/distaneetradeoffinadditiontoadirectionalchange.滑轮可被用于简单地改变作用力的方向,或除了改变方向外还提供一个力和距离的权衡。5.Thereareanumberofdifferentstandardgeartypes・Examplesincludespurgears,changegears,clustergears,helicalgears,herringbonegears,straightbevelorspiralbevelgears,wormgears,a
4、ndsoonandsoforth・有许多不同的标准齿伦的类型。实例包括正齿伦,变速齿伦,簇齿伦组,斜齿伦,人字齿伦,直齿锥或螺旋锥齿轮,蜗轮,依此类推等等。6.Acammechanismusuallyconsistsoftwomovingelements,thecamandthefollower.一凸轮机构,通常包括两个运动元件,该凸伦和从动件。7.Wecanclassifycammechanismsbythemodesofinput/outputmotion,theconfigurationandarrangemento
5、fthefollower,andtheshapeofthecam・我们可以通过输入/输出运动,配置和从动的布置,和凸轮的形状的模式分类凸轮机构。8」nacammechanism,whenthecamturnsthroughonemotioncycle,thefollowerexecutesaseriesofeventsconsistingofrises,dwellsandreturns.在一个凸轮机构中,当凸轮转过一个运动周期吋,从动件执行一系列由上升、停留和返冋的动作。9.Electronsandprotonsaresa
6、idtohaveoppositeelectriccharges・电了和质了具冇相反的电荷。10.Voltagecanbegeneratedbymeansotherthanrubbingcertaintypesofmaterialsagainsteachother.Chemicalreactions?radiantenergy,andtheinflueneeofmagnetismonconductorsareafewwaysinwhichvoltagemaybeproduced・电压除了能通过一些类型不同的材料相互摩擦产生之
7、外,化学反应,辐射能,磁场对导体的影响也是产生电压的方法。9.Kirchho什sCurrentLawstatesthatthesumofthecurrentsenteringanodemustbezero・基尔霍夫电流定律陈述了流过-•个节点的电流总和必须为零。10.KirchhoffsVoltageLawstatesthatthesumofthepotentialdropsaroundaloopinacircuitmustbezero.基尔霍夫电压定律陈述了在电路中的冋路的点位下降总和必须为零。13」fasinusoid
8、allyvaryingvoltagesource,onethatoscillatespositivelyandnegativelyintimewiththeshapeofasinewave,isconnectedacrossthecapacitor,itcanbeshownthatthevoltagea