您所在的当前位置：初中物理试题 >

惯性

> 如图所示、叶子同学穿着旱冰鞋用力向前推墙，她将向后运动，下列说法错误是 A.物体间力的作用是相互的 B.力可以改变物体的运动状态 C.穿着旱冰鞋是为了增大摩擦 D.离开墙后人的运动是由于惯性

问题：

发布时间：2024-09-12

如图所示、叶子同学穿着旱冰鞋用力向前推墙，她将向后运动，下列说法错误是

A.物体间力的作用是相互的
B.力可以改变物体的运动状态
C.穿着旱冰鞋是为了增大摩擦
D.离开墙后人的运动是由于惯性

参考答案：

提问用户：Gm***F2P

可能感兴趣的题目：

1 2000-2005年我国人口年平均增长率（0.63%）比1995-2000年的平均增长率（0.91%）低0.28个百分点．据此回答．我国人口的基本国情是 A.人口基数大，增长速度加快 B.人口基数大，增长速度减缓 C.人口基数小，增长速度加快 D.人口基数小，增长速度减缓
2 阅读理解。 One summer night Ludwig Beethoven took a walk in the suburb (市郊) of Bonn. Suddenly a gentle wind came. He heard some music. He listened carefully and found it was his F sonata. He followed the music and came to a small house. There through the window, he saw a girl playing a very old piano and a young man was making shoes beside her, he pushed the door open and went in. The host received him very warmly and told him that the girl was his sister, who was blind but very fond of music . They couldn’t afford to send her to a master. So she was only trying to play to some music she heard the neighbors play. She knew it was the work of a great composer (作曲家). Beethoven was very much moved. Suddenly the candle was blown out. Moonlight struck on the girl’s slender figure. Then Beethoven played music for them. He played so wonderful that the brother and sister were amazed. That was his famous Clair de lune. 1. Beethoven heard the music because ______. A. it was played loudly B. there was a slight wind C. the piano was old D. he stopped walking 2. The young man and the girl were _____. A. brother and sister B. husband and wif C. lovers D. good friends 3. The girl couldn’t go to the teacher most probably because_____. A. she was blind B. her brother didn’t want her to go C. they were too poor D. good friends 4. Beethoven played some music____. A. before he was moved B. as soon as he came in C. when he saw the piano D. after he heard the moving story
3 Betty is very popular because she is easy____ . A．to be getting along B．to be got along with C．to get along with D．to get along
4 When I try to understand ____ that prevents so many Americans from being as happy as one might expect, it seems to me that there are two causes. A．why does it B．what does it C．what it is D．why it is
5 2005年7月26日，美国“发现号”航天飞机从肯尼迪航天中心发射升空，飞行中一只飞鸟撞上了航天飞机的外挂油箱，幸好当时速度不大，航天飞机有惊无险．假设某航天器的总质量为10t，以8km/s的速度高速运行时迎面撞上一只速度为10m/s、质量为5kg的大鸟，碰撞时间为1.0×10 -5s，则撞击过程中的平均作用力约为（　　） A．4×l09N B．8×109 N C．8×l012N D．5×106 N
6 向某盐溶液中通入过量Cl 2无明显现象，滴加Ba(NO 3) 2溶液和稀HNO 3后，有白色沉淀生成，则原溶液可能是(　　) A．AgNO3溶液 B．CaCl2溶液 C．Na2SO3溶液 D．Na2CO3溶液
7 已知 a ， b 均为单位向量，它们的夹角为120°，则 | a -2 b |=（　　） A． 3 B． 5 C． 7 D． 10
8 读图，回答3~5题。小题1:与太湖平原、珠江三角洲等地区相比，图中所示平原地区作为商品粮生产基地的优势条件是（） A．单位面积产量高 B．人均耕地面积大 C．交通发达 D．水热条件好小题2:城市Q的某家具厂生产的实木家具销往全国许多地方。影响该厂布局的主导因素是（） A．原料产地 B．消费市场 C．廉价劳动力 D．高素质的技术开发人员小题3:限制该地区农业生产基地发展的重大生态问题（） A．草场退化和土地沙化 B．灌溉水源缺乏和低洼易涝 C．水土流失和土壤酸化 D．黑土流失和湿地退化
9 在某城市的一条道路上，规定车辆行驶速度不得超过40km／h。在一次交通事故中，肇事车是一辆卡车，量得这辆卡车紧急刹车（车轮被抱死）时留下的刹车痕迹长为9m，已知该卡车紧急刹车时的加速度大小是8m／s 2。 (1）判断该车是否超速。 (2）求刹车时间。 (3）求刹车过程中的平均速度。
10 忽略空气阻力，抛出后的小球在空中运动轨迹如图所示，抛出后的小球由于 A.不受力，运动状态发生改变 B.不受力，运动状态不发生改变 C.受到重力作用，运动状态发生改变 D.受到推力作用，运动状态发生改变