当前位置:首页>学习笔记>【2026版高中物理粤教版必修一册学习笔记练透word培优讲义第二章第二节第2课时匀变速直线运动速度与位移的关系v-t图像的应

【2026版高中物理粤教版必修一册学习笔记练透word培优讲义第二章第二节第2课时匀变速直线运动速度与位移的关系v-t图像的应

  • 2026-03-22 14:38:12
【2026版高中物理粤教版必修一册学习笔记练透word培优讲义第二章第二节第2课时匀变速直线运动速度与位移的关系v-t图像的应

v-t图像的应用

[学习目标]1.理解匀变速直线运动的速度与位移的关系,并会进行相关计算(重点)。2.熟练利用v-t图像求位移、加速度以及判断物体的运动情况。

一、速度与位移的关系

试由s=v0t+at2vt=v0+at,消去时间t,推导速度与位移的关系式。

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1.匀变速直线运动速度与位移的关系式:。 

2.适用范围:仅适用于直线运动。 

3.公式的矢量性:公式中v0vtas都是矢量,应用时必须选取正方向,一般选v0的方向为正方向。

若是加速运动,a值,若是减速运动,a值。 

对于匀变速直线运动的两个公式s=v0t+at2-=2as,我们应用时应该如何选择?

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1(2023·广州市白云中学高一期末)在一次交通事故中,交通警察测量出肇事车辆的刹车痕迹是14 m,该车辆的最大刹车加速度是7 m/s2,该路段的限速是60 km/h,则该车是否超速(  )

A.超速B.不超速

C.无法判断D.刚好是60 km/h

2(2023·广州西关外国语学校高一期末)冰壶,又称掷冰壶、冰上溜石,是以队为单位在冰上进行的一种投掷性竞赛项目,属冬奥会比赛项目。冰壶被投掷出去队员不摩擦冰面时可认为冰壶做匀减速运动,若冰壶以1.6 m/s的速度被掷出时,在冰面上滑行了8 m,则冰壶以3.2 m/s的速度被掷出时,在冰面上滑行的距离为(  )

A.8 mB.16 m

C.24 mD.32 m

3某型号航空母舰上装有帮助战斗机起飞的弹射系统,已知某型号的战斗机在跑道上加速时能获得的最大加速度为5.0 m/s2,当战斗机的速度达到50 m/s时才能离开航空母舰起飞。设航空母舰处于静止状态。问:

(1)若要求该战斗机滑行160 m后起飞,弹射系统必须使战斗机具有多大的初速度?

(2)若某舰上不装弹射系统,要求该型号战斗机仍能在此舰上正常起飞,问该舰身长至少应为多长?

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二、v-t图像的应用

1.利用v-t图像求位移

v-t图线与横轴所围的“面积”表示位移。“面积”在时间轴上方表示位移为正,“面积”在时间轴下方表示位移为负;通过的位移为时间轴上、下“面积”绝对值之差。通过的路程为时间轴上、下“面积”绝对值之和。

2.理解

(1)初速度为v0的匀加速直线运动的v-t图像如图甲,其中v0t与矩形面积相等,at2与三角形面积相等,所以s=v0t+at2

(2)当物体做匀减速直线运动时,如图乙,公式中的a取负值。相当于从匀速直线运动的位移中“减去”了一部分。

4(多选)(2023·广州市高一期末)一物体自t=0时开始做直线运动,其速度—时间图像如图所示。下列选项正确的是(  )

A.在t=5 s时,物体离出发点距离最远为35 m

B.在4~5 s内,物体的加速度方向与速度方向相同

C.在0~6 s内,物体的平均速度为5 m/s

D.在0~6 s内,物体的位移大小等于路程

5(2023·广州市高一期末)我国“蛟龙”号深潜器在某次实验时,深潜器内的显示屏上显示出了从水面开始下潜到最后返回水面10 min内全过程的深度随时间变化的h-t曲线如图甲和速度随时间变化的v-t图像如图乙,则下列说法正确的是(  )

A.图甲中h3代表本次下潜最大深度,大小为360 m

B.全过程中最大加速度是2 m/s2

C.深潜器加速度向上发生在0~1 min和6~8 min的时间段内

D.6~10 min内,深潜器的加速度不变

通过网盘分享的文件:word讲义

链接: https://pan.baidu.com/s/1ApPu4Bf1G3WQmBT-14h94g?pwd=4321 提取码: 4321 

--来自百度网盘超级会员v8的分享

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  1. CONNECT:[ UseTime:0.000723s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000752s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000279s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000286s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000524s ]
  6. SELECT * FROM `set` [ RunTime:0.000209s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000566s ]
  8. SELECT * FROM `article` WHERE `id` = 476504 LIMIT 1 [ RunTime:0.002245s ]
  9. UPDATE `article` SET `lasttime` = 1774178735 WHERE `id` = 476504 [ RunTime:0.006519s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000244s ]
  11. SELECT * FROM `article` WHERE `id` < 476504 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000599s ]
  12. SELECT * FROM `article` WHERE `id` > 476504 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000361s ]
  13. SELECT * FROM `article` WHERE `id` < 476504 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000879s ]
  14. SELECT * FROM `article` WHERE `id` < 476504 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000622s ]
  15. SELECT * FROM `article` WHERE `id` < 476504 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005134s ]
0.167368s