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《机械能》易错简析r/STRONG>《机械能》易错简析 - 惊鸿岂止一现 - 云雷屯,君子以经纶-高垚骏的物理空间"b it_="常思十句话让你更成熟 - 安国的博客 - 安国的博客tr0 opag"_blank"mp.ph.126yt f/dT45DHeSZE61GzY_vABTGw==/15782abo94417802166.jpt" 3prdet="0ef=____="ev_9733723818s=f=____="ev_7018386650s=f=yr/A>点击查看链接_blank" hid168jxwalblos=le">168r/A>点击查看链接_blank" hid168jxwalblos=le">教学网址教师博客r/A>usha;usha;usha;高垚骏的物理空间(初中版)m-A>bl/PytyrP ody o="TEXT-INDENT: 2emitr0 >usha;usha;usha;usha;usha;usha;usha;usha;usha;usha;usha;usha;usha;l/PytyrP ody o="TEXT-INDENT: 2emitr0 >usha;usha;usha;usha;usha;usha;usha;usha;usha;usha;usha;usha; 初中物理教师的博客r/A>usha;usha;usha;usha;usha;高垚骏的物理空间(高中版)m-A>usha;点击查看链接_blank"teachau#ahrdudcn/p/TeachauStudio.ava1?i=xzyggyj" le">高垚骏的个人主页m-A>初中物理老师教育博客与物理教学网荟萃usha;<-A>blA litl />点击查看链接_blank"218.22.21.249/salce/=uody71848s=le">“国培计划(2011)”高垚骏的博客r/A>bl/PytyrHR0ody nullef=>tytytyty

《机械能》易错简析山东省高唐县琉寺中学 李洪生
tyrSTYLE> #trs_ .e4pxd_1332469:0 281 {d .chan< cl: ightd .chantyrBR>tyrP ody o="TEXT-INDENT: 2emitr0 >一、概念模糊,错误理解(对动能和势能概念的错误理解)m-PytyrP ody o="TEXT-INDENT: 2emitr0 >usha;m-PytyrP ody o="TEXT-INDENT: 2emitr0 >例1.关于动能和势能的概念,下列说法中正确的是(usha;usha;usha; )m-PytyrP ody o="TEXT-INDENT: 2emitr0 >usha;m-PytyrP ody o="TEXT-INDENT: 2emitr0 >A.运动的物体具有的能量,叫做动能m-PytyrP ody o="TEXT-INDENT: 2emitr0 >usha;m-PytyrP ody o="TEXT-INDENT: 2emitr0 >B.运动物体的质量越大,所具有的动能一定越大m-PytyrP ody o="TEXT-INDENT: 2emitr0 >usha;m-PytyrP ody o="TEXT-INDENT: 2emitr0 >C.弹性形变较大的物体,具有的弹性势能一定较大m-PytyrP ody o="TEXT-INDENT: 2emitr0 >usha;m-PytyrP ody o="TEXT-INDENT: 2emitr0 >D.被举得较高的物体,其重力势能不一定较大m-PytyrP ody o="TEXT-INDENT: 2emitr0 >usha;m-PytyrP ody o="TEXT-INDENT: 2emitr0 >错解:Am-PytyrP ody o="TEXT-INDENT: 2emitr0 >usha;m-PytyrP ody o="TEXT-INDENT: 2emitr0 >错解分析:A中的说法看起来跟动能的定义差不多,好多同学易选A,但实质上是有区别的,运动的物体具有的能量除了动能之外,也可能还有重力势能和弹性势能,所以A不对;物体的动能除了与物体的质量有关之外,还与物体运动的速度有关,所以B不对;不同的弹性物体,其弹性势能的大小除与形变的程度有关外,还与物体本身的性质有关,所以弹性形变较大的物体,具有的弹性势能不一定较大,因此C不对,这也易选错。对于相同质量的物体,被举得较高的物体,其重力势能较大,对于不同质量的物体,需要同时考虑质量和被举高度。所以正确答案是D。正确答案:D二、审题不细,考虑不周(对动能和势能影响因素的错误判断)m-PytyrP ody o="TEXT-INDENT: 2emitr0 >usha;m-PytyrP ody o="TEXT-INDENT: 2emitr0 >例2.蹦床运动是运动员从蹦床弹向空中表演技巧动作的一项体育活动。但运动员离开蹦床弹向空中的过程中,运动员具有的(usha;usha;usha; )m-PytyrP ody o="TEXT-INDENT: 2emitr0 >usha;m-PytyrP ody o="TEXT-INDENT: 2emitr0 >A.动能增加,势能减少usha;usha;usha;usha;usha;usha;usha;usha;usha;usha; B.动能增加,势能增加C.动能减少,势能减少usha;usha;usha;usha;usha;usha;usha;usha;usha;usha; D.动能减少,势能增加错解:Am-PytyrP ody o="TEXT-INDENT: 2emitr0 >usha;m-PytyrP ody o="TEXT-INDENT: 2emitr0 >错解分析:本题多是分析失误,没看清要求“运动员离开蹦床弹向空中的过程”,所以误选A;但运动员离开蹦床弹向空中时,速度越来越小,高度越来越大,而运动员质量不变,所以动能逐渐减少,重力势能逐渐增加,因此正确答案为D。正确答案:D三、思维片面,忽视条件(机械能是否守恒)m-PytyrP ody o="TEXT-INDENT: 2emitr0 >usha;m-PytyrP ody o="TEXT-INDENT: 2emitr0 >例3.甲乙两个完全相同的皮球,在同一水平面上以大小相等的速度,同时将甲球竖直向上抛出,将乙球竖直向下抛出,两球在地面上反复弹跳,运动中不计空气阻力,与地面碰撞时不计能量损失,则下列说法正确的是(usha;usha;usha; )m-PytyrP ody o="TEXT-INDENT: 2emitr0 >usha;m-PytyrP ody o="TEXT-INDENT: 2emitr0 >A.球在下降时,重力势能减少,动能增大usha;usha;usha; B.抛出时刻,甲球的动能大于乙球的动能C.任何时刻,两球的机械能都相等usha;usha;usha;usha;usha;usha;usha;usha;usha; D.甲球的最大势能大于乙球的最大势能错解:Am-PytyrP ody o="TEXT-INDENT: 2emitr0 >usha;m-PytyrP ody o="TEXT-INDENT: 2emitr0 >错解分析:在不计空气阻力和碰撞时的能量损失,皮球在整个运动过程机械能守恒,球在空中下降到未碰到地面前,重力势能减小,动能增大。但碰到地面后,皮球被压缩,动能减小,弹性势能增大,所以A不对,A答案易忽视球碰地被压缩这一过程,所以易选错;在抛出时刻,甲乙两球速度相等,高度相同,因此两球的动能相同,这里势能相同,所以B也不对;在运动中不计空气阻力和碰撞时的能量损失,所以两球在运动中机械能不变,在抛出点两球的动能相等,重力势能也相等,所以机械能也相等,因此任何时刻,两球的机械能大小都相等,所以答案C是正确的;由于两球机械能守恒且相等,所以它们的最大势能相等,因此D不对。正确答案:C
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