如图所示用200n的拉力拉着物体a在水平面上匀速前进物体b以01ms的速度匀速前进．若a与�轮相连的绳子c受的拉力大小是140n不计 Sketch Coloring Page

如图所示用200n的拉力拉着物体a在水平面上匀速前进物体b以01ms的速度匀速前进．若a与�轮相连的绳子c受的拉力大小是140n不计 Template

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tomski如图所示用200n的拉力拉着物体a在水平面上匀速前进物体b以01ms的速度匀速前进．若a与�轮相连的绳子c受的拉力大小是140n不计 coloring

30．如图所示用�轮组提起重G的物体绳子自由端拉力为F重物以速度勘匀速上升不计�擦和绳重则 1�轮组的机械效率为 2 sketch template

如图1所示小雨用200N的拉力利用�轮组在空中匀速提升密度为3×103kg/m3的物体A此时机械效率为90%不计绳重�擦和水的阻力求 sketch template

用如图甲所示的�轮组提升物体M，已知物体M所受的重力为550N，卷扬机加在绳子自由端的拉力F将物体M在20s内沿竖直方�匀速提升10m，拉力F sketch template

如图所示用200N的拉力拉着物体A在水平面上匀速前进物体B以01m/s的速度匀速前进．若A与�轮相连的绳子C受的拉力大小是140N不计 sketch template

如图所示用F为40 N的拉力通过�轮组拉着重为300 N的物体A在水平面上以04 M/s的速度�左做匀速直线运动物体受到的�擦力是物重 sketch template

如图所示，用三根轻绳将质量为m的物块悬挂在空中。已知ac和bc与竖直方�的夹角分别为30°和60°，重力加速度为g。请选择合适的研究对象，画出 sketch template

用四个�轮和两根相同的绳子组成如图所示的甲、乙两个�轮组用它们匀速提起货物在绳自由端施加竖直的拉力分别为F甲和F乙物重分别为G甲和G乙 sketch template

如图所示用200N的拉力拉着物体A在水平面上匀速�左运动物体A与�轮相连的绳子所受的拉力为A所受�擦力的4倍若不计�轮重绳重及�轮装置 sketch template

如图所示用绳子系住小球靠在墙上物体重16N绳受到20N拉力试画出物体受到重力和拉力的示意图．题目和参考答案——青夏教育精英家教�—— sketch template

如图所示A、B两小球分别用轻质细绳L1和轻弹簧系在天花板上A、B两小球之间用一轻质细绳L2连接细绳L1、弹簧与竖直方�的夹角均为θ细绳 sketch template

在图所示的�轮组中用110N的力在5s内把重为200N的物体匀速提高2m则 A．对重物做的有用功约为200J B．�轮组的机械效率约为90 sketch template

14．如图8所示用恒力F通过光�的定�轮将静止于水平面上的物体从位置A拉到位置B物体可视为质点定�轮距水平面高为h物体在位置AB时 sketch template

如图所示在与水平地面成θ角的拉力F作用下质量为m的物块沿地面�右做匀速直线运动 1试求物体与地面间的�动�擦因数 2若把此力F sketch template

日常生活中�们有时要用同样长的两根绳子挂一个物体如图1所示如果绳子的最大拉力为F物体受到的重力为G你能否用�量的知识分析绳子受到的 sketch template

如图所示用三段轻绳将重物悬挂在空中此时绳OB保持水平绳OA与竖直方�夹角为30°．1画出结点O的受力示意图．2如果绳OA上的拉力 sketch template

如图所示一轻质弹簧的下端固定在水平面上上端叠放着两个质量均为M的物体AB弹簧的劲度系数为k初始时物体处于静止状态．现用竖直�上的 sketch template

如图所示的�轮组拉动物体A沿水平地面匀速前进已知物体A的重力为500N拉力大小为50N则物体与地面间的�擦力f=150150N若物体 sketch template

如图所示用F=6N的水平�右的拉力匀速拉动物块A时物块B静止不动此时弹簧测力计示数为4N则物块B所受�擦力大小及方�为 A sketch template

6．如图2所示水平地面上的物体A在斜�上的拉力F作用下�右作匀速直线运动则 A．物体A可能不受地面支持力的作用 B．物体A可能受到三个 sketch template

如图3所示用弹簧测力计水平拉动水平桌面上的物体使其匀速直线�动以下叙述中的二个力属于作用力与反作用力的是 A．物体对桌面的压力与桌面对 sketch template

光�水平地面上叠放着两个物体A和B如图7所示．水平拉力F作用在物体B上使AB两物体从静止出�一起运动．经过时间t撤去拉力F再经过时间 sketch template

如图所示用细绳的一端栓在物体上再将细线绕过项端高度为h的定�轮用大小和方�都不变的拉力F作用在绳的另一端．用力拉细线使质量为M的物体 sketch template

如图所示相同材料制成的粗糙程度相同的两个物块AB中间用一不可伸长的轻绳连接用一相同大小的恒力F作用在A物体上使两物块沿力的方�一起运动 sketch template

如图所示某人用�轮组匀逮提升重120N的物体人的拉力为50N在2s内绳的自由端移动了6米1物体上升的高度2人所做的额外功是 sketch template

如图所示重为80N的物体在大小为20N方�水平�右的拉力F1作用下在水平面上以2m/s速度做匀速直线运动．当撤去拉力F1物体静止后 sketch template

如图所示用平行斜面�下的拉力F将一个物体沿斜面往下拉动拉力的大小等于�擦力则 A．物体做匀速运动 B．合力对物体所做的功等于零 C sketch template

如图所示用F=200牛的拉力拉着物体A以3米/秒的速度在水平地面上匀速前进则物体B的运动速度为66米/秒．若物体B与水平地面的�擦力大小为 sketch template

如图所示是探究声音产生及其特性的小实验1用手拨动�料尺�料尺会�出声音说明声音是由物体的振动而产生．2若增大�料尺振动的幅度则 sketch template

如图所示质量为44kg的物体放在水平地面上用与水平方�成37°斜�上的大小为200N的拉力拉物体使物体沿水平地面做匀速直线运动 sketch template

如图所示水平面上叠放着两个物体A和BmA=2kgmB=3kg两物体在10N的水平拉力作用下一起做匀速直线运动则A和B之间的�擦力大小 sketch template

如图所示用一个动�轮把重200N的物体提高了1m所用的拉力为125N则动�轮所做的有用功W有用= J它的机械效率η= ．若不计�擦被 sketch template

如图所示用细绳系着一个小球使小球在水平面内做匀速圆�运动不计空气阻力关于小球受力说法正确的是A．只受重力 B．只受拉力C．受重力拉力 sketch template

用如图所示的�轮组匀速提升重为480N的物体G所用拉力F为200N将重物提升3 M所用的时间为10s．求 1重物上升的速度．03m sketch template

如图所示用�轮组拉着物体A是正方体铁块边长是30cm．当拉力F=70N时物体A恰好做匀速直线运动．动�轮重15N已知ρ铁=78× sketch template

如图所示用绳AC和BC吊起一个物体绳AC与竖直方�的夹角为60°绳BC与竖直方�的夹角为30°两绳能承受的最大拉力均为100Ng sketch template

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