7．如图所示用两根绳子oa和ob系住以重物绳oa的一端固定于a点手拉绳ob使ob由水平位置逐渐转�方�同时保持oa与天花板夹角θ不变 Sketch Coloring Page

7．如图所示用两根绳子oa和ob系住以重物绳oa的一端固定于a点手拉绳ob使ob由水平位置逐渐转�方�同时保持oa与天花板夹角θ不变 Template

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tomski7．如图所示用两根绳子oa和ob系住以重物绳oa的一端固定于a点手拉绳ob使ob由水平位置逐渐转�方�同时保持oa与天花板夹角θ不变 coloring

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

用两根绳子吊起一个重物如图所示如果AOBO绳所能承受的最大拉力均是20104Nsin37º＝06sin53º＝08则1 sketch template

6．如图所示一根粗细不均匀的木材用两根轻绳悬挂在天花板上下列判断正确的是 A 木材的重心位置在AB的中点 B 绳OA受到的拉力 sketch template

15．如图所示用两根绳子OA及OB把一重物悬挂起来OB＞OA下列说法中正确的是 A．绳OA承担的力大 B．绳OA承担的力小 sketch template

用两根绳子AC和BC吊起一重物两绳与水平方�的夹角如图所示已知G＝200N则 1重力沿AC方�的分力为 N2重力沿BC方�的 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

用两根绳子系住一重物如图所示绳OA与天花板间的夹角 不变当用手拉绳子OB使OB由水平转�竖直的过程中 OB绳所受的拉力将 A．始终 sketch template

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

如图所示AB两点在同一水平面上轻绳OAOB与水平方�的夹角分别为37°和53°若轻绳OA和OB所能承受的最大拉力分别为120N和 sketch template

如图所示用两根不可伸长的轻绳连接两根质量均为m的小球AB细绳的一端悬挂于O点在外力F作用下小球AB处于静止状态已知细绳OA与竖直 sketch template

如图所示用两根绳子吊起一重物使重物保持静止逐渐增大两绳子之间夹角则两绳子的拉力的合力变化情况是 A不变 B减小 C增大 D sketch template

用两根绳子吊起一个重物如图10所示如果每根绳所能承受的最大拉力是20104Nsin37＝06sin53＝08求 1吊 sketch template

如图所示完全相同的质量为m的AB两球用两根等长的细线悬挂在O点两球之间夹着一根劲度系数为k的轻弹簧静止不动时弹簧处于水平方�两根 sketch template

百度教育 sketch template

7．如图所示用两根绳子OA和OB系住以重物绳OA的一端固定于A点手拉绳OB使OB由水平位置逐渐转�方�同时保持OA与天花板夹角θ不变 sketch template

如图所示对于同一高度的两个定�轮AB用一条足够长的绳子跨过它们并在两端分别挂有质量为m1和m2的物体m1≠m2 另在两�轮中间的 sketch template

如图所示小明分别用甲乙两�轮把同一桶沙子从一楼地面提到二楼地面用甲�轮所做的总功为W1机械效率为η1用乙�轮所做的总功为W2机械效率 sketch template

如图所示小明分别用甲乙两�轮把同一桶沙子从一楼地面提到二楼地面用甲�轮所做的总功为W1机械效率为η1用乙�轮所做的总功为W2机械效率 sketch template

如图所示把一个物体挂在绳子的中点已知AC=BC=3cmCD=1cm此时AC与BC绳拉力均为15N求1两根绳子拉力的合力2 sketch template

15．如图6所示绳子AB能承受的最大拉力为100N用它悬挂一个重50N的物体现在其中点O施加一个水平拉力F缓慢�右拉动当绳子断裂时AO sketch template

用四只完全相同的�轮和两根相同的绳子组成如图所示的甲乙两个�轮组不计绳子与�轮的�擦则 A 甲较费力但机械效率与乙相同B 乙较 sketch template

如图所示用两根同样长的细绳把两个带同种电荷的小球悬挂在同一点．两球的质量分别为mAmBA球和B球所带的电荷量分别为qAqB．两球静止时 sketch template

如图所示将一根不可伸长柔软的轻绳两端分别系于AB两点一物体用动�轮悬挂在绳子上达到平衡时两段绳子间夹角为θ1绳子张力为F1将 sketch template

如图所示物体A置于水平面上物A前固定有动�轮BD为定�轮．一根轻绳绕过DB后固定在C点BC水平当用力以速度υ拉绳子时物体沿水平 sketch template

力的三角形法则的应用知乎 sketch template

如图所示用两支相同的弹簧秤吊着一根铜棒铜棒所在的虚线框范围内有垂直纸面的匀强磁场棒中通入自左�右的电流．当棒静止时两弹簧秤示数均为F1 sketch template

10．用相同的定�轮和动�轮组成甲乙两个�轮组如图8所示用它们来提升同一重物甲�轮组将重物举高1m乙�轮组将重物举高2m在不计绳 sketch template

2．如图所示用两根钢丝绳AB与BC将电线杆DB支持住AD=5mDC＝9mDB＝12m若希望电线杆不会�生倾斜则两绳拉力TAB sketch template

如图所示，用轻绳将两根通电直导线悬挂在天花板上的点 高途 sketch template

7．如图所示一直角斜面体固定在地面上斜面倾角分别为30°和60°ab两物体分别系于一根跨过定�轮的轻绳两端置于斜面上ab可看成 sketch template

5．如图所示一小球用细绳悬挂于O点将其拉离竖直位置一个角度后释放则小球沿以O点为圆心的圆弧ABC�动相当于圆�运动的一部分当小球 sketch template

如图所示�轮重及�轮�擦不计物体A和B都处于静止状态下列几种说法中正确的是A．两物体重力的大小关系是G1＝2G2B．A物体受到的�擦力的 sketch template

2．如图所示用两根同样的绝缘细线把甲乙两个质量相等的带电小球悬挂在同一点上甲乙两球均处于静止状态．已知两球带同种电荷且甲球的电荷量 sketch template

百度教育 sketch template

15．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的示数为4N则物块B所受�擦力的大小为 N�擦 sketch template

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