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好题天天解——(可下载)一道最新力学试题的修改及探源——思路是关键,乐于推导好习惯

  • 2026-02-23 02:15:08
好题天天解——(可下载)一道最新力学试题的修改及探源——思路是关键,乐于推导好习惯

好题天天解——(可下载)一道最新力学试题的修改及探源——思路方法是关键,乐于推导好习惯

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题目一、

15、如图,一粗糙斜面固定在地面上,斜面顶端装有一光滑轻质定滑轮。一细绳跨过滑轮,其一端与斜面上的物块M相连,另一端跨过两个等高的固定的光滑轻滑轮K与光滑小球N相连,小球N置于半球面上,半球面的圆心O恰与滑轮K处在同一竖直线上,整个系统处于静止状态。现水平向左缓慢移动半球,则

A、半球面对小球N的支持力大小不变 

B、M所受细绳的拉力大小一定一直减小 

C、定滑轮K受到的弹力先增大后减小

D、M所受斜面的摩擦力大小可能一直减小

这是今年的一道最新试题,具体来源查不到。但类似题目前几年出现过。这道试题中的选项C“定滑轮K受到的弹力先增大后减小”叙述不妥当,定滑轮K受到轴的作用力和绳子的作用力,都属于弹力。所以必须叙述清楚是“定滑轮K受到绳子的作用力先增大后减小”(估计命题人意图就是这样)或者“定滑轮K受到轴的作用力先增大后减小”。

常见的类似题目如下:

题目二、如图所示,一粗糙斜面固定在地面上,斜面顶端装有一光滑定滑轮。一细绳跨过滑轮,其一端与斜面上的物块M相连,另一端跨过固定的光滑滑轮K与光滑小球N相连,小球N置于半球面上,半球面的圆心O恰与滑轮K处在同一竖直线上,整个系统处于静止状态。现水平向左缓慢移动半球面,直至小球N达到O正上方,已知M始终保持静止。则在此过程中(  )

A.半球面对小球N的支持力大小一直增加

B.M所受细绳的拉力大小一定一直不变

C.M所受斜面的摩擦力大小可能一直增加

D.M所受斜面的摩擦力大小可能一直减小 

【答案】CD

【来源】贵州省贵阳市五校2022-2023学年高三上学期联合考试理综物理试题(二)

【知识点】直接合成法解决三力平衡问题、用相似三角形解决平衡问题

【详解】

AB.对小球N进行受力分析,受重力mg、半球面对小球N的支持力F和受细绳的拉力T,如图甲所示,当半球面向左缓慢移动少许后,容易得到如图甲中的两个相似阴影三角形;当半球面向左缓慢移动少许后,如图乙所示,相似关系仍然存在,由相似关系和由平衡条件可得小球受力图如图丙所示,设KNOα,∠KONβ,∠NKOγ,则有

由拉密定理(正弦定理)可得

可知γβ增大,α减小,则有T一直减小,F可能增大可能不变可能减小,故AB错误;

CD.对M做受力分析,如图丁所示,设斜面的倾斜角为θ,由牛顿第三定律可知T′=T,若初始时

可知T减小时,即T减小,f一直减小或先减小后反向增大;

若初始时

可知T减小时,即T′减小,f一直增大,故CD正确。

故选CD。

题目三、如图所示,小球A通过小滑轮P用细线悬挂在空中,细线一端固定在点,另一端跨过小滑轮O1连接一弹簧。弹簧下端与小球B连接,小球B置于粗糙水平面上的光滑半圆柱体上,两球均处于静止状态。已知B球质量为m,小滑轮O1用轻杆固定在半圆柱体圆心的正上方,O1B与竖直方向成30°角,O1B长度与半圆柱体半径相等,O1P与竖直方向成60°角,细线、滑轮、弹簧质量可忽略不计,则下列叙述正确的是(

D.若将AB两小球的质量均加倍,PM与竖直方向夹角变化

【答案】CD

【来源】四川省内江市威远中学校2025-2026学年高一上学期12月月考物理试题

【知识点】直接合成法解决三力平衡问题

【详解】

A.对小球B分析,受拉力、重力、支持力处于平衡状态,根据几何关系和平衡条件可得

方向与竖直方向夹角为30°,则根据牛顿第三定律,B对圆柱体压力

C.对滑轮O1分析,根据平衡条件,

故C正确;

D.若将AB两小球的质量均加倍,假设PM与竖直方向夹角保持不变,根据

则绳拉力扩大两倍,则弹簧拉力扩大两倍,则弹簧伸长,则B位置改变,则O1B与竖直方向不成30°角,则此时不再满足

即B质量扩大两倍,绳拉力并未扩大两倍,前后矛盾,则假设不成立,即PM与竖直方向夹角发生改变,故D正确。

故选CD。

题目四、如图,一轻绳绕过定滑轮C(半径可忽略)一端连接小球A(可视为质点),另一端连接物体B。物体B放在粗糙水平地面上,受到水平向右的力F的作用,使得小球A沿光滑固定的半球面从图示位置缓慢向上移动,定滑轮C在半球面球心O的正上方,已知OC的长度为2R,半球面的半径为R。小球A向上移动到球心O正上方D点的过程中,下列说法正确的是(  )

A.轻绳的拉力减小

B.半球面对小球A的支持力变大 

C.地面对物体B的摩擦力减小

D.地面对半球面的作用力增大 

【答案】AD

【来源】2026届山西省A10联盟高三上学期9月学情诊断物理试卷(C)

【知识点】用相似三角形解决平衡问题

【详解】

AB.小球A沿光滑半球面缓慢运动过程中,小球A受到重力、轻绳的拉力T、半球面对A的支持力N的作用,处于三力平衡状态,根据相似三角形法知

可得轻绳的拉力T逐渐减小,支持力N不变,故A正确、B错误;

C.物体B向右运动,受到轻绳的张力、重力、地面的支持力和滑动摩擦力f、水平拉力F的作用。因为轻绳的张力T减小,轻绳与竖直方向的夹角θ增大,可知张力的竖直分力Tcosθ减小,则地面对物体B的支持力增大,摩擦力f增大,故C错误;

D.小球A对半球面的压力大小不变,其方向与竖直方向夹角变小,则压力与半球面的重力的合力增大,此合力与地面对半球面的作用力为一对平衡力,故地面对半球面的作用力增大,故D正确。

故选AD。

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推荐阅读:

好题天天解——(可下载)高一寒假复习讲义及试题3 相互作用

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好题天天解——(可下载)肇庆市2026届高中毕业班第一学期末教学质量监测(做了大量修改!) 

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  1. CONNECT:[ UseTime:0.000427s ] mysql:host=127.0.0.1;port=3306;dbname=no_yeyulingfeng;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000813s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000349s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000507s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000606s ]
  6. SELECT * FROM `set` [ RunTime:0.000322s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000781s ]
  8. SELECT * FROM `article` WHERE `id` = 469682 LIMIT 1 [ RunTime:0.000567s ]
  9. UPDATE `article` SET `lasttime` = 1771803537 WHERE `id` = 469682 [ RunTime:0.003064s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000356s ]
  11. SELECT * FROM `article` WHERE `id` < 469682 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000690s ]
  12. SELECT * FROM `article` WHERE `id` > 469682 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001048s ]
  13. SELECT * FROM `article` WHERE `id` < 469682 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004001s ]
  14. SELECT * FROM `article` WHERE `id` < 469682 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003715s ]
  15. SELECT * FROM `article` WHERE `id` < 469682 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006042s ]
0.111713s