教科版（2017秋）科学五年上册3.4《机械摆钟》课课练（含答案）

新版科学五年上册3.4《机械摆钟》课课练（含答案）
一、单选题
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1.单摆在摆动的过程中(
???)。
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A.摆幅会越来越大
B.来回摆动一次的时间越来越慢
C.摆幅会越来越小
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2.我们用秒表测得一个摆在1分钟内摆动了60次，那它在2分钟内可摆动(
??)。?
A.?90次??????????B.?120次?????????????C.?150次??????????????????D.?180次
3.计时工具(
??)的提高要靠技术、材料等的改进。?
A.?美观性?????????????B.?准确性?????????????C.?实用性????????????D.?时尚性
4.机械摆钟的出现大大提高了计时器的精确度，机械摆钟是利用了(??
?)原理。
A.?单摆的等时性????B.?摆钟的时效性??????C.?时区的差异性
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5.我们自己制作的摆，在摆动时会发生(??
?)的现象。
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A.摆动一次所需时间逐渐加快
B.摆幅逐渐增大
C.摆幅逐渐减小
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6.人类计时器的发展有一定的顺序，从简单到精细的一组是(
??)。
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A.?日晷-水钟-摆钟??????B.?摆钟-日晷-水钟???????C.?水钟
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"https:?/??/?mp.weixin.?/?_blank?)-摆钟-日晷
7.右图是傅科摆的示意图，在高60多米的屋项挂一个摆，沿地面AB线方向摆动，过了一段时间，摆的摆动方向(
??)。?
?
A.?沿AB方向不变?????????B.?沿CD线方向摆动??????????C.?沿EF线方向摆动
8.观察摆在摆动的过程中，下列(
??)现象不可能观察到。
A.?摆动的方向可能会慢慢偏转
B.?摆动的速度越来越慢
C.?摆锤每次晃到左边和右边的高度不同
9.现代钟表的原动力是机械力和(
??)力两种。?
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A.?重???????????B.?水??????????C.?电
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10.在观察摆的活动中，我们发现(
??)。???????????
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A.?摆动的幅度越来越小，摆动的速度也越来越小B.?摆动的幅度保持不变，摆动的速度却越来越小
C.?摆动的幅度越来越小，摆动的速度却保持不变D.?摆动的幅度保持不变，摆动的速度也保持不变
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B.?摆动的幅度保持不变，摆动的速度却越来越小
C.?摆动的幅度越来越小，摆动的速度却保持不变
D.?摆动的幅度保持不变，摆动的速度也保持不变
11.用铁架台做支架，挂上一个摆。将铁架台和摆一起放到一个转盘上，让摆左右(?)摆起来。缓慢逆
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"https:?/??/?mp.weixin.?/?_blank?)时针转动转盘90°，我们发现摆的摆动方向是(
???)。
A.变成前后(?)摆动
B.依然左右(?)摆动，
C.随意摆动
二、判断题
12.最先发现了摆的秘密的科学家是意大利的伽利略。（???）
13.摆钟是根据摆的等时性制成的。（???）
14.机械摆钟是一种利用摆来计时的时钟。（???）
15.摆在摆动过程中每往复一次，我们就说摆摆动了一次。（???）
16.机械摆钟受天气和温度的影响。（???）
17.在观察摆钟摆动次数是否相同时，需要对摆动次数进行多次测量。（???）
18.如果一个摆的摆动幅度越来越小，那么它每来回摆动一次所花的时间会越来越短。（???）???
19.同一个摆每摆动10次所用的时间都是相同的。（???）
20.我们自己做的摆，摆动时方向可能会发生偏转。（???）
21.摆钟是根据摆的等时性原理发明的。（???）
三、填空题
22.虽然像日晷、水钟以及燃油钟、沙漏等一些简易的时钟，已经可以让我们知道大概的时间，但是人们总希望有更精确的时钟，________的出现大大提高了时钟的精确度。???
23.拿一条细绳，上端固定，下端挂上一个小重物，就组成了一个简单的________这样的摆中，细绳充当________，重物充当________???
24.做一个摆，观察摆动过程中有哪些现象发生?________
①摆动的方向会慢慢偏转
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②摆线越来越长了
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③摆幅越摆越小
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④摆动的速度越来越慢
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⑤摆锤每次晃到左边和右边的高度基本相同
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25.下列有3个一样的单摆以及3个一样的磁铁，把磁铁分别吸到下列3个摆的铁片上，如下图所示。请在表格内按
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"https:?/??/?mp.weixin.?/?_blank?)摆速由快到慢的顺序给3个摆排序。?
?
快
中等
慢
________号摆
________号摆
________号摆
26.同一个单摆每摆动一次所需的时间是________的。???
27.1656年，如图所示的________产生于荷兰天文学家、数学家克里斯蒂安·惠更斯的实验室内。它是以________发现的________的摆动具有规律性这个原理为基础而发明的。自此以后人类掌握了比较精确的测量时间的方法。
28.生活中类似摆的现象有________?、________??、________?等。
29.摆在摆动时，________，叫摆动一次。
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30.实验已证明摆具有保持摆动方向________的特点。?
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四、解答题
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31.你见过摆钟吗?想一想，它是用什么来调节快慢的。
答案
1.
C??2.
B??3.
B??4.
A??5.
C??
6.
A??7.
B??8.
C??9.
C??10.
C??11.
B??
12.?正确??13.?正确??14.?正确??15.?正确??
16.?错误??17.?正确??18.?错误??19.?正确??
20.?正确??21.?正确??22.?摆钟??
23.?摆；摆绳；摆锤??
24.
①③④⑤??
25.
①；②；③??
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26.?相同??
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27.?摆钟；伽利略；摆??
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28.?秋千；不倒翁；重锤线??
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29.?摆出去再回来??
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30.?不变??
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31.?解：可以改变摆钟的摆长来调解摆钟的快慢。?
?