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培优讲义作业9匀变速直线运动速度与时间的关系、位移与时间的关系

【2026版高中物理粤教版必修一册学习笔记练透word培优讲义作业9匀变速直线运动速度与时间的关系、位移与时间的关系

  • 2026-03-22 03:01:09
【2026版高中物理粤教版必修一册学习笔记练透word培优讲义作业9匀变速直线运动速度与时间的关系、位移与时间的关系

(分值:100分)

1~8题每题8分,共64

考点一速度公式vt=v0+at

1.对于运动学公式vt=v0+at,下列说法正确的是(  )

A.可以求出任意运动状态下物体的速度

B.仅适用于匀变速直线运动

C.物体的末速度一定大于物体的初速度

D.vtv0均只能取正值

2.2023·汕头市高一期中)一物体做初速度为0、加速度为a的匀加速直线运动。该物体在1 s末、2 s末的速度之比为(  )

A.12B.14

C.16D.18

3.2023·湛江市高一期末)核潜艇是战略核威慑手段之一,我国自主研制的“094A”核潜艇在世界上处于比较领先的地位。如图所示,在某次实战训练中潜艇遇到情况需要紧急下潜,假设在某段时间内可视为匀减速下潜,若在这段时间内5 s末的速度比2 s末的速度小3 m/s,则“094A”潜艇在该段时间内的加速度大小为(  )

A.1 m/s2B.1.5 m/s2

C.2 m/s2D.3 m/s2

4.一物体做匀加速直线运动。到达A点时的速度为5 m/s,后经3 s到达B点时的速度为14 m/s,再经过4 s到达C点,则它到达C点时的速度大小为(  )

A.23 m/sB.5 m/s

C.26 m/sD.10 m/s

5.某汽车装备了具有“全力自动刹车”功能的城市安全系统,系统以50 Hz的频率监视前方的交通状况。当车速v≤36 km/h且与前方静止的障碍物之间的距离接近安全距离时,如果司机未采取制动措施,系统就会立即启动“全力自动刹车”,使汽车避免与障碍物相撞。在上述条件下,若该车在不同路况下的“全力自动刹车”的加速度大小为4~6 m/s2,则“全力自动刹车”的最长时间为(  )

A. sB. s

C.2.5 s D.12.5 s

考点二位移公式s=v0t+at2

6.一质点在t=0时刻开始做初速度为2 m/s、加速度为4 m/s2的匀加速直线运动,在0~2 s内质点的位移大小为(  )

A.10 mB.12 m

C.14 mD.16 m

7.2023·肇庆市高一期末)汽车刹车的运动可看作匀减速直线运动,刹车后其位移s与时间t的关系为s=20t-2t2 (m)(各物理量均采用国际单位制单位),则该汽车(  )

A.开始刹车时的初速度是10 m/s

B.加速度大小为4 m/s2

C.汽车刹车后10 s停下

D.汽车刹车后第1 s内的位移为15 m

8.2023·广东湛江二十一中高一期中)一辆汽车以20 m/s的速度在平直公路上匀速行驶,突然发现前方发生了事故,立即刹车,若汽车做匀减速直线运动,加速度大小为5 m/s2,则从开始刹车到停下来的时间和位移分别为(  )

A.4 s,80 mB.4 s,40 m

C.2 s,40 mD.4 s,20 m

910题每题9分,1118分,共36

9.2023·深圳市高一期末)初速度为8 m/s的汽车在平直公路上做匀减速直线运动直到停止,经过2 s后速度减小到6 m/s,则开始减速10 s内的位移大小是(  )

A.80 mB.40 m

C.32 mD.30 m

10.2023·广东番禺中学高一期末)汽车刹车做匀减速直线运动,最后1 s内的位移为s0恰好是第1 s内的位移的,则第3 s内的位移是(  )

A.s0B.2s0

C.3s0D.4s0

11.(18分)一物体做匀减速直线运动,初速度大小为v0=5 m/s,加速度大小为0.5 m/s2,求:

(1)(9分)物体在前3 s内的位移大小;

(2)(9分)物体在第3 s内的位移大小。

答案精析

1.B [运动学公式vt=v0+at是匀变速直线运动的运动规律,不能求任意运动状态下的物体速度,故A错误,B正确;匀变速直线运动有匀加速直线运动和匀减速直线运动,所以物体的末速度不一定大于物体的初速度,vtv0也不一定都取正值,故CD错误。

2.A [初速度为0、加速度为a的物体在1s末、2s末的速度之比为v1v2=at1at2=12,故选A

3.A [5s末的速度为v5,2s末的速度v2=v5+3m/s,时间Δt=3s,潜艇在该段时间内的加速度a===-1m/s2,故潜艇在该段时间内的加速度大小为1m/s2,故BCD错误,A正确。

4.C [物体的加速度为a==m/s2=3m/s2,vC=vB+at2=14m/s+3×4m/s=26m/s,C正确。

5.C 36km/h=10m/s,车速最大,刹车时的加速度最小时,刹车时间最长,则t==s=2.5s,故选C

6.B [根据匀变速直线运动的位移公式得s=v0t+at2=2×2m+×4×22m=12m,故B正确。

7.B [s=v0t+at2以及s=20t-2t2 (m)可知,汽车的初速度和加速度大小分别为20m/s4m/s2,A错误,B正确;汽车从开始刹车到停下所用的时间为t=s=5s,C错误;汽车刹车后第1s内的位移为s1=20×1m-2×12m=18m,D错误。

8.B [根据vt=v0+at,有t==s=4s,由s=v0t+at2,有s=20×4m+×(-5)×42m=40m,故选B

9.C [由题可知,汽车的加速度a=,解得a=-1m/s2,当汽车停下时,末速度为0,即0=v0+at,解得t=8s<10s,所以汽车减速了8s就停止,则汽车10s内的位移s=v0t+at2,解得s=32m,故选C

10.A [根据题意,汽车刹车后做匀减速直线运动直到静止,可以逆向思维看成初速度为零的匀加速直线运动,设初速度为v0,加速度大小为a,由运动学公式s=v0t+at2,有s0=a×(1s)2,5s0=v0×1s-a×(1s)2,解得a=2s0(m/s2),v0=6s0(m/s),由公式vt=v0+at可得,刹车停止的时间为t=3s,则最后1s内的位移即为第3s内的位移,第3s内的位移是s0。故选A

11.(1)12.75 m (2)3.75 m

解析(1)取初速度方向为正方向

v0=5m/s,a=-0.5m/s2

3s内物体的位移s3=v0t3+a=5×3m+×(-0.5)×32m=12.75m

(2)同理,前2s内物体的位移

s2=v0t2+a=5×2m+×(-0.5)×22m=9m

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  1. CONNECT:[ UseTime:0.001017s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001572s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000732s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000680s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001275s ]
  6. SELECT * FROM `set` [ RunTime:0.000579s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001464s ]
  8. SELECT * FROM `article` WHERE `id` = 476371 LIMIT 1 [ RunTime:0.001216s ]
  9. UPDATE `article` SET `lasttime` = 1774202867 WHERE `id` = 476371 [ RunTime:0.019174s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000621s ]
  11. SELECT * FROM `article` WHERE `id` < 476371 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001101s ]
  12. SELECT * FROM `article` WHERE `id` > 476371 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001103s ]
  13. SELECT * FROM `article` WHERE `id` < 476371 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001639s ]
  14. SELECT * FROM `article` WHERE `id` < 476371 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006478s ]
  15. SELECT * FROM `article` WHERE `id` < 476371 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002600s ]
0.186209s