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【26版物理步步高同步人教版学习笔记必修第一册第一章专题强化从x-t图像看速度

  • 2026-03-07 20:33:16
【26版物理步步高同步人教版学习笔记必修第一册第一章专题强化从x-t图像看速度

x-t图像看速度

[学习目标] 1.能利用x-t图像判断速度的大小和方向(重点)。2.理解x-t图像相交即相遇(重点)。

1.已知两点P(x1,y1),Q(x2,y2),如果x1x2,则直线PQ的斜率为k=(x1x2)=

2.斜率表示图像的倾斜程度

图中的三条直线分别是甲、乙、丙三物体运动的x-t图像。

(1)试分析甲、乙、丙三物体的运动图像斜率的意义。

(2)求甲、乙、丙三物体运动的速度。

(3)在t=5s时,三图线相交,交点坐标有什么意义?

____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

1.x-t图像为倾斜直线时,表示物体做匀速直线运动,如图中的ab所示。

直线的斜率(k=)表示物体的速度,斜率的绝对值表示速度的大小,斜率的正、负表示物体的运动方向,如图所示,b图线表示物体向正方向运动,a图线表示物体向负方向运动。

2.纵截距表示运动物体的初始位移,如图所示,a所代表的物体的初始位置在x1处;b所代表的物体的初始位置在坐标原点。

3.交点表示同一时刻位于同一位置,即两物体相遇。

如图所示为物体A、B的x-t图像,试分析:

(1)A、B两物体的速度如何变化?

(2)0~t0时间内A、B的平均速度的关系?

____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

x-t图像为曲线时,表示物体做变速运动。某时刻的瞬时速度等于该时刻图线上对应点的切线的斜率。

1(多选)一辆汽车沿平直道路行驶,以x表示它相对出发点的位移,汽车在0~40 s内运动的x-t图像如图所示。则汽车(  )

A.10~20 s内做匀速运动

B.前10 s内速率是后20 s内速率的两倍

C.前10 s内与后20 s内运动方向相反

D.始终沿同一方向运动

2 质点沿直线运动,其位移—时间图像如图所示,关于质点的运动,下列说法中正确的是(  )

A.2 s末质点的位移为零,前2 s内位移为负,后2 s内位移为正,所以2 s末质点改变了运动方向

B.0~2 s内质点的位移为零,速度为零

C.质点做匀速直线运动,速度大小为0.1 m/s,方向与规定的正方向相反

D.质点在0~4 s内的位移大小为0.4 m,位移的方向与规定的正方向相同

3(多选)(2024·广州市高一期中)甲、乙两物体从同一点出发且在同一条直线上运动,它们的位移—时间(x-t)图像如图所示,由图像可以得出(  )

A.甲、乙两物体0~2 s运动方向相同,2~4 s运动方向相反

B.0~4 s甲的平均速度等于乙的平均速度

C.4 s末甲、乙两物体相遇

D.4 s末甲、乙两物体的速度大小相等

4(2024·泊头市第一中学高一期中)在平直公路并排车道上行驶的甲、乙两车,其运动的位移—时间(x-t)图像分别如图中直线a、曲线b所示,t=3 s时,直线a和曲线b刚好相切,下列说法正确的是(  )

A.甲车的速度始终大于乙车的速度

B.0~3 s内甲车的速度大小为6 m/s

C.0~3 s内乙车的平均速度大小为6 m/s

D.甲、乙两车在t=3 s时速度相等

针对训练1 (2024·陕西省西乡县第一中学高一期中)甲、乙两物体沿同一直线运动,它们的x-t图像如图所示,下列选项中不正确的是(  )

A.t=0时刻,甲、乙相距250 m

B.乙运动后,甲、乙相向做匀速直线运动

C.乙运动后,甲、乙速度大小之比为21

通过网盘分享的文件:word讲义等2个文件

链接: https://pan.baidu.com/s/10u4A4UHo4nIo8baxixnEvg?pwd=4321 提取码: 4321 

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  1. CONNECT:[ UseTime:0.000824s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001438s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000634s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000527s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001087s ]
  6. SELECT * FROM `set` [ RunTime:0.000716s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001248s ]
  8. SELECT * FROM `article` WHERE `id` = 472602 LIMIT 1 [ RunTime:0.000943s ]
  9. UPDATE `article` SET `lasttime` = 1772891314 WHERE `id` = 472602 [ RunTime:0.004447s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000498s ]
  11. SELECT * FROM `article` WHERE `id` < 472602 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001066s ]
  12. SELECT * FROM `article` WHERE `id` > 472602 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000917s ]
  13. SELECT * FROM `article` WHERE `id` < 472602 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001847s ]
  14. SELECT * FROM `article` WHERE `id` < 472602 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001880s ]
  15. SELECT * FROM `article` WHERE `id` < 472602 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004779s ]
0.108622s