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12682019年中考物理试题分类汇编(五)——32水平方向滑轮组问题专题(word版含答案)474.50KB474.50Bdocczwlzx吴江czwlzx/UploadFiles/UserPic/UserAvatars/15219_150_150.jpg
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吴江12019年中考物理试题分类汇编(五),水平方向,滑轮组问题2019年10月12日/UploadFiles/nopic.gif
1.(2019鸡西,27)如图所示,小聪用滑轮组拉动水平地面上重为500N的物体A,使它匀速前进2m,地面对它的摩1.(2019鸡西,27)如图所示,小聪用滑轮组拉动水平地面上重为500N的物体A,使它匀速前进2m,地面对它的摩擦力为150N,小聪施加的拉力F=100N(忽略绳重和滑轮重),则滑轮组做的有用功为 J,滑轮组的机械效率为 。2.(2019绵阳,11)用水平力F1拉动如图所示装置,使木板A在粗糙水平面上向右匀速运动,物块B在木板A上表面相对地面静止,连接B与竖直墙壁之间的水平绳的拉力大小为F2。不计滑轮重和绳重,滑轮轴光滑。则F1与F2的大小关系是A. F1=F2B. F2<F1<2F2C. F1=2F2D. F1>2F23.(2019海南,16)小明想把被台风刮倒的树拉正。他把绳子的一端系在乙树上,然后绕过甲树用力拉绳子,这样做有_____段绳子拉甲树。如果不计绳重和摩擦
【内容简介】1.(2019鸡西,27)如图所示,小聪用滑轮组拉动水平地面上重为500N的物体A,使它匀速前进2m,地面对它的摩擦力为150N,小聪施加的拉力F=100N(忽略绳重和滑轮重),则滑轮组做的有用功为 J,滑轮组的机械效率为 。2.(2019绵阳,11)用水平力F1拉动如图所示装置,使木板A在粗糙水平面上向右匀速运动,物块B在木板A上表面相对地面静止,连接B与竖直墙壁之间的水平绳的拉力大小为F2。不计滑轮重和绳重,滑轮轴光滑。则F1与F2的大小关系是A. F1=F2B. F22F23.(2019海南,16)小明想把被台风刮倒的树拉正。他把绳子的一端系在乙树上,然后绕过甲树用力拉绳子,这样做有_____段绳子拉甲树。如果不计绳重和摩擦,甲树受300N拉力,则小明对绳子的拉力至少为________N。4.(2019常德,22)如图所示,弹簧测力计和细线的重力及一切摩擦均不计,物重G=5N,则弹簧测力计A的示数为 N,弹簧测力计B的示数为 N。1.(2019鸡西,27)如图所示,小聪用滑轮组拉动水平地面上重为500N的物体A,使它匀速前进2m,地面对它的摩擦力为150N,小聪施加的拉力F=100N(忽略绳重和滑轮重
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2019年中考物理试题分类汇编(五)(共72个专题)
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下载地址1|sj/2019/10/2019101214106.doc<p style="line-height: 150%"><strong><span style="font-family:华文仿宋">1.</span></strong><strong><span style=";line-height:150%;font-family:华文仿宋;color:blue">(2019鸡西,27)</span></strong><strong><span style=";line-height:150%;font-family:华文仿宋">如图所示,小聪用滑轮组拉动水平地面上重为500N的物体A,使它匀速前进2m,地面对它的摩擦力为150N,小聪施加的拉力F=100N(忽略绳重和滑轮重),则滑轮组做的有用功为<span style="text-decoration:underline;"> </span>J,滑轮组的机械效率为<span style="text-decoration:underline;"> </span>。</span></strong></p><p style="text-align:center;line-height:150%"><strong><span style=";line-height:150%;font-family:华文仿宋"><img width="206" height="84" src="http://www.czwlzx.com/UEditor/themes/default/images/spacer.gif" alt=" " style="background:url(http://www.czwlzx.com/UEditor/lang/zh-cn/images/localimage.png) no-repeat center center;border:1px solid #ddd" /></span></strong></p><p style="line-height: 150%;vertical-align: middle"><strong><span style=";line-height:150%;font-family:华文仿宋;color:#C00000">2.</span></strong><strong><span style=";line-height:150%;font-family:华文仿宋;color:blue">(2019绵阳,11)</span></strong><strong><span style="line-height: 150%;font-family: 华文仿宋">用水平力<em>F</em><sub>1</sub>拉动如图所示装置,使木板A在粗糙水平面上向右匀速运动,物块B在木板A上表面相对地面静止,连接B与竖直墙壁之间的水平绳的拉力大小为<em>F</em><sub>2</sub>。不计滑轮重和绳重,滑轮轴光滑。则<em>F</em><sub>1</sub>与<em>F</em><sub>2</sub>的大小关系是</span></strong></p><p style="text-align:center;line-height:150%;vertical-align:middle"><strong><span style="font-family:华文仿宋"><img width="303" height="75" src="http://www.czwlzx.com/UEditor/themes/default/images/spacer.gif" style="background:url(http://www.czwlzx.com/UEditor/lang/zh-cn/images/localimage.png) no-repeat center center;border:1px solid #ddd" /></span></strong></p><p style="line-height: 150%;vertical-align: middle"><strong><span style="line-height: 150%;font-family: 华文仿宋">A. <em>F</em><sub>1</sub>=<em>F</em><sub>2</sub></span></strong></p><p style="line-height: 150%;vertical-align: middle"><strong><span style="line-height: 150%;font-family: 华文仿宋">B. <em>F</em><sub>2</sub><<em>F</em><sub>1</sub><2<em>F</em><sub>2</sub></span></strong></p><p style="line-height: 150%;vertical-align: middle"><strong><span style="line-height: 150%;font-family: 华文仿宋">C. <em>F</em><sub>1</sub>=2<em>F</em><sub>2</sub></span></strong></p><p style="line-height: 150%;vertical-align: middle"><strong><span style="line-height: 150%;font-family: 华文仿宋">D. <em>F</em><sub>1</sub>>2<em>F</em><sub>2</sub></span></strong></p><p style="line-height: 150%;vertical-align: middle"><strong><span style="font-family:华文仿宋;color:blue">3.</span></strong><strong><span style="line-height: 150%;font-family: 华文仿宋">(2019海南,16)小明想把被台风刮倒的树拉正。他把绳子的一端系在乙树上,然后绕过甲树用力拉绳子,这样做有_____段绳子拉甲树。如果不计绳重和摩擦,甲树受300N拉力,则小明对绳子的拉力至少为________N。</span></strong></p><p style="text-align:center;line-height:150%;vertical-align:middle"><strong><span style="font-family:华文仿宋"><img width="140" height="79" src="http://www.czwlzx.com/UEditor/themes/default/images/spacer.gif" style="background:url(http://www.czwlzx.com/UEditor/lang/zh-cn/images/localimage.png) no-repeat center center;border:1px solid #ddd" /></span></strong></p><p style="line-height:150%"><strong><span style=";line-height:150%;font-family:华文仿宋;color:#C00000">4.</span></strong><strong><span style=";line-height:150%;font-family:华文仿宋;color:blue">(2019常德,22)</span></strong><strong><span style=";line-height:150%;font-family:华文仿宋">如图所示,弹簧测力计和细线的重力及一切摩擦均不计,物重G=5N,则弹簧测力计A的示数为<span style="text-decoration:underline;"> </span>N,弹簧测力计B的示数为<span style="text-decoration:underline;"> </span>N。</span></strong></p><p><br /></p>不限不限试题试卷专供vip会员doc
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