八年级物理浮力计算题3篇(经典八年级物理浮力计算题)

时间:2022-12-24 15:22:30 综合范文

  下面是范文网小编整理的八年级物理浮力计算题3篇(经典八年级物理浮力计算题),供大家阅读。

八年级物理浮力计算题3篇(经典八年级物理浮力计算题)

八年级物理浮力计算题1

  21.—Is it _________ bag?—No, it’s an old cap

.

  22.—What does your brother look like?—He is _____________.

and and handsome

  23.—You swim so taught you?—Learn by __________.

mother is ill in have to ___________ my grandparents at at

  25.—Are you afraid of dogs?— ______________., I , I , I don’, I did.—What _______ do you choose, small, medium or large?

—Large,

  27.—Our classroom is so clean.—It ___________ every cleaned cleaned

  28.—There’s going to _______ an English evening tonight? Would you like to go with us?—I’d love

  29.—What can I do for you?—_________________.’m just ’ll take ’m just it easy 30.—May I play computer games, Mom?—No, you ____________.’t

’’’t

  31.—Jane, when did you come here?

—In ___________ here for two been gone been

  32.—I really hate to go to such a noisy place.—_____________. am do I

have can I

  33.—__________ go out for a picnic next Saturday.—Good about

you like ’s

  34.—__________ do you go to the library?

—Twice a much

often

far

  35.—I wonder ____________ at 8:00 last night?

—I was watching were you did you do

you were doing

are you doing

  II.完形填空(10分)(阅读下面短文,然后根据短文内容,从三个选

  项中选择能填入相应空白处的最佳选项,并在答题卡的相应位置将其涂黑)

  Showing your feeling is is a mistake not to talk to anyone ___36_ you’re feeling sad, worried or you keep bad feelings inside, it can even make you37 _.But if you38with someone, like your mom or dad, you’ll usually begin to feel 39_than you’re not all alone with your problems or , it doesn’t mean your problems and worries will41magically(神奇地).But, at least, someone else understands what’s42with you and can help43find ways to solve your mom and dad want to know if you love you and they want to know what’s happening in your if you don’t want to talk with them, what should you do? Find a trustworthy(可信任的)teacher at school or a that person can help you deal with your you’ll feel as45as

  III、情景交际(15分)

(1)从B栏中找出与A栏相对应的答语,并在答题卡的相应位置将其涂黑。(5分)A

  B

weekends!!Who’s this, please? yourself to some you very ’s the date today? do you do? , may I speak to Mike?

same to do you do? 23rd, 2013.(2)从框里选择填入对话相应空白处的适当选项,并在答题卡的相应位置将涂黑

like a quiet yourself in the do you want to live in the countryside?

are you going to do in the summer holidays?

animals give us joy and can help us do some useful things

  A: Hi, Darren!It’s a nice day, isn’t it? B: Yes,it ____

  A: I plan to visit my grandparents during the summer holidays in the :Really? 52_________

  A: Because of too much noise in the _________.What’s more, there are many green plants in the like : I also like plants, but I like animals :Why do you think so?

  B: 54_________ They are our : I think I should also make an animal friend

  A: I think I should also make an animal : 55_____________ A: Thank you

  阅读理解(40分)

  I、阅读理解(20分)(阅读I和II两篇短文,从56-65每小题所给的选项中选出最佳答案,并在答题卡的相应位置将其涂黑。

  IWonderful Tour(4-Day)of Tongren

  Overseas Tourist Corporation Guizhou China Including:

  Places to visit:Price: Only ¥2,668★A round-trip(往返旅行)plane ticket from Guiyang to Tongren ★Bus service around Tongren ★Three nights’stay in good hotels ★The best tour guide service

★Ming Paradise(大明边城)—the national AAAA level scenic spots(景点)★Hot Spring in Shiqian(石阡)—enjoy spas/spring bath(泡温泉/温泉浴)★Mount Fanjing—the most famous mountain in Guizhou Office hours:

  Monday-Friday8:00 -8:00 &Sunday9:00 -7:00 : 0851-Address: Yanan Road Guiyang

the information above, we know this map

air piece of news

ad.(advertisement) can’t enjoyin a bus around Tongren

in good hotels

some small presents a good tour guide service can visit ___________ places if you take the

can you book the tour? writing chatting with them sending them an can you go to book a ticket to Tongren?

station

Yanan Road Guiyang

  II

  In the year 2050, there will be different kinds of materials for materials will keep the clothes clean for will never get dirty or wear will have less work because we won’t have to wash we can save water and children won’t worry about what to wear to school every won’t go to ’ll stay at home in front of their computers to can wear their favorite “Saturday clothes” every will be you think so? What do you think school clothes and school life will be like in 2050?

wewash clothes in the year ’’t

’t

’t be allowed to won’t the children go to school? they’ll play at they hate to go to they’ll study on the they’ll wash clothes to make the clothes get dirty in the year 2050?

, it won’, they , it , they won’ the year 2050, the clothes will notfor ever out or get thinner and fantastic

the passage,which of the following is NOT true? will be different kinds of materials for children can wear their favorite children always worry about what to children can study at home in front of their 、阅读判断(10分)(根据短文内容判断66-70题的正误。正确的用A,错误的用B,并 在答题卡的相应位置将其涂黑)

  Robots have been designed to do many things, such as saving people, working in a hospital, serving for us and so are some robots working in the Jinjiang Robot Hotel in Tongren, hundred customers can have a big dinner in it of the robots serve drinks, while the other four serve the not all the work in the restaurant is done by are also people working there, especially in the cooks are humans, because the robots don’t have the skills to can work in a robots work in the Jinjiang Robot people work in the can serve drinks and the robots can cook delicious 任务型阅读(10分)

  本部分试题在卷II(76-80小题)

  卷II

  听力II(10分)(听一篇短文,根据所听到的短文内容填写表格。每空一词。答案务必另 书写于答题卡卷II各小题规定的位置。)Before dinner Arrive on 71.____________You’d better bring a 72._________ gift

  During dinner Just 73.________ what you dinner

  Don’t leave at once or stay too 74.___ ___

  Call the host or write a thank-you 75.___ ___

  任务型阅读(10分)(阅读下面短文,然后根据短文内容每空填写一个单词完成76—80 小题。答案书写于答题卡卷II各小题规定的位置。)

  Richard, 14, said, “ I want to make friends, but I don’t know my last school, my classmates often bullied(欺负)me and I didn’t have any at this school look OK, but I just know I’ll also do something help me!”

  Perhaps the best way to make friends is to know what makes a asked some 13-year-old boys and girls to write down they liked about their said that good friends:

★go around with happy faces.★like to share.★stay and play together with others.★invite people to do something★are humorous.★are good at organizing games.★help others with work.★are kind.★ are good at thinking of something fun to do

  Good friends

  Go around 76.__________ happy faces like to share

  Stay and play together with _________ others with 78.________ and __________ people to do good at organizing games and thinking of something 80._________to do

  书面表达(40分)

  I.单词拼写(10分)

  I.根据括号里所给单词(汉语)的适当形式填空。答案书写于答题卡卷II各小题规定的位置。 of us should love our lives and obey the traffic __________(规则). along this road and turn ________(左边)at the second are often ________(忙碌的)with their harvest in , the capital of China, is one of the oldest ________(city)in —What’s the secret of your ________(success)?

—Work hard.书面表达(40分)

  I.单词拼写(10分)

  I.根据括号里所给单词(汉语)的适当形式填空。答案书写于答题卡卷II各小题规定的位置。 of us should love our lives and obey the traffic __________(规则). along this road and turn ________(左边)at the second are often ________(忙碌的)with their harvest in , the capital of China, is one of the oldest ________(city)in —What’s the secret of your ________(success)?

—Work 短文改错(10分)

  下列短文的划线部分是错误的,请将其正确答案书写于答题卡卷II各小题规定的位置。Twenty years old, an old man who is over older, went to see his son was happy his mother and picked up the phone and said,93.“Hello, bring me any good food.” A moment later, beautiful girl brought the food “What magical the phone is!” the old man

to a little days,he went back to his the picked up the phone as soon as he gets said, “Hello, some delicious food, please.” Then he waited waited or nobody brought him

  III.写作(20分)

  温馨提示:(作文书写于答题卡卷II规定的位置。)

  在铜仁市开展“4+2”特色教育活动中,你是怎么做的。请根据内容提示,用英语写一篇短文。

  内容提示:每天早上做早操......每天课外活动时间打球、唱歌、跳舞.....每天至少运动一小时我擅长......参考词汇: do morning exercisesplay basketball/ping pongdancesong songshave at least...for sports every daybe good at/do well inwin 要求:

  1.语言表达准确,语意通顺、连贯; 2.书写工整、规范;

  3.根据所给内容和参考词汇,可适当发挥; 4.文中不得出现真实的校名和人名;

  5.词数:70词左右。文章的开头,和结尾己给出, 不计入总词数。

  Students all take an active part in Tongren Four and Two Special Education Acitivities in our morning, I

  综合运用 21-55满分40分.(21-50每小题1分;51-55每小题2分;)

阅读理解(56-70每小题2分,满分30分)

  卷II

  听力II(71-75每小题2分;满分10分)

任务型阅读(76-80每小题2分;满分10分)

  书面表达(81-100每小题1分;作文满分20分;满分40分)I.单词拼写(10)

  I.短文改错(10)

八年级物理浮力计算题2

  物理学史集中地体现了人类探索和逐步认识世界的现象,结构,特性,规律和本质的历程.随着科学的发展,我们更要重视物理学。因此小编准备了八年级下物理浮力课件,欢迎阅读。

  1、浮力的定义:一切浸入液体(气体)的物体都受到液体(气体)对它竖直向上的力 叫浮力。

  2、浮力方向:竖直向上,施力物体:液(气)体

  3、浮力产生的原因(实质):液(气)体对物体向上的压力大于向下的压力,向上、向下的压力差 即浮力。

  4、物体的浮沉条件:

(1)前提条件:物体浸没在液体中,且只受浮力和重力。

(2)请根据示意图完成下空。

  下沉 悬浮 上浮 漂浮

  F浮 G F浮 = G F浮 G F浮 = G

  物 液 物

(3)、说明:

① 密度均匀的物体悬浮(或漂浮)在某液体中,若把物体切成大小不等的两块,则大块、小块都悬浮(或漂浮)。

②一物体漂浮在密度为的液体中,若露出体积为物体总体积的1/3,则物体密度为(2/3)

  分析:F浮 = G 则:液V排g =物Vg

  物=(V排/V)?液= 2 3液

③ 悬浮与漂浮的比较

  相同: F浮 = G

  不同:悬浮液 =V排=V物

  漂浮液 物;v排④判断物体浮沉(状态)有两种方法:比较F浮 与G或比较液与物。

⑤ 物体吊在测力计上,在空中重力为G,浸在密度为的液体中,示数为F则物体密度为:物= G/(G-F)

⑥冰或冰中含有木块、蜡块、等密度小于水的物体,冰化为水后液面不变,冰中含有铁块、石块等密大于水的物体,冰化为水后液面下降。

  5、阿基米德原理:

(1)、内容:浸入液体里的物体受到向上的浮力,浮力的大小等于它排开的液体受到的重力。

(2)、公式表示:F浮 = G排 =液V排g 从公式中可以看出:液体对物体的浮力与液体的密度和物体排开液体的体积有关,而与物体的质量、体积、重力、形状、浸没的深度等均无关。

(3)、适用条件:液体(或气体)

  6、漂浮问题五规律:(历年中考频率较高,)

  规律一:物体漂浮在液体中,所受的浮力等于它受的重力;

  规律二:同一物体在不同液体里,所受浮力相同;

  规律三:同一物体在不同液体里漂浮,在密度大的液体里浸入的体积小;

  规律四:漂浮物体浸入液体的体积是它总体积的几分之几,物体密度就是液体密度的几分之几;

  规律五:将漂浮物体全部浸入液体里,需加的竖直向下的外力等于液体对物体增大的浮力。

  7、浮力的利用:

(1)、轮船:

  工作原理:要使密度大于水的材料制成能够漂浮在水面上的物体必须把它做成空心的,使它能够排开更多的水。

  排水量:轮船满载时排开水的质量。单位 t 由排水量m 可计算出:排开液体的体积V排=;排开液体的重力G排 = m g;轮船受到的浮力F浮 = m g 轮船和货物共重G=m g。

(2)、潜水艇:

  工作原理:潜水艇的下潜和上浮是靠改变自身重力来实现的。

(3)、气球和飞艇:

  工作原理:气球是利用空气的浮力升空的。气球里充的是密度小于空气的气体如:氢气、氦气或热空气。为了能定向航行而不随风飘荡,人们把气球发展成为飞艇。

(4)、密度计:

  原理:利用物体的漂浮条件来进行工作。

  构造:下面的铝粒能使密度计直立在液体中。

  刻度:刻度线从上到下,对应的液体密度越来越大

  8、浮力计算题方法总结

(1)、确定研究对象,认准要研究的物体。

(2)、分析物体受力情况画出受力示意图,判断物体在液体中所处的状态(看是否静止或做匀速直线运动)。

(3)、选择合适的方法列出等式(一般考虑平衡条件)。

  计算浮力方法:

①称量法:F浮= G-F(用弹簧测力计测浮力)。

②压力差法:F浮= F向上-F向下(用浮力产生的原因求浮力)

③漂浮、悬浮时,F浮=G(二力平衡求浮力;)

④F浮=G排 或F浮=液V排g(阿基米德原理求浮力,知道物体排开液体的质量或体积时常用)

⑤根据浮沉条件比较浮力(知道物体质量时常用)

八年级物理浮力计算题3

  浮力计算专题

  1、如图15所示,容器中装有水,水中有一个木块被细线系着,已知水重200N,水深为,木块的体积为4dm,木块的密度为×10kg/m,试求:(1)木块受到的浮力是多大?

(2)若绳子断了,最终木块漂浮在水面上时,所受的浮力为多大? 3332、用一弹簧测力计挂着一实心圆柱体,圆柱体的底面刚好与水面接触(未浸入水)如图甲,然后将其逐渐浸入水中,如图乙是弹簧测力计示数随柱体逐渐浸入水中的深度变化情况,求:(g取10N/kg)(1)圆柱体受的最大浮力。(2)圆柱体的密度。

  3、一个不规则的实心物体,质量55g,放入装满纯水的烧杯中,沉入底部,排开的水。然后向烧杯中加盐并搅拌,直到物体悬浮为止。g=10N/kg)求:(1)物体在纯水中所受的浮力;(2)物体的体积:

(3)物体悬浮时盐水的密度。

  5、一带阀门的圆柱形容器,底面积是300cm2,装有13cm深的水。正方体A边长为12cm,重25N,用细绳悬挂放入水中,有1/6的体积露出水面,如图11所示。试求:(1)A受到的浮力

(2)若细绳所能承受的最大拉力是,通过阀门K缓慢放水,当绳子刚要被拉断的瞬间,容器中液面下降的高度。(取g =10N/kg)

  7、密度是×10 kg/ m的木块,体积是4 m当它浮在水面上时,取g=10 N/kg,求: 3

  33(1)木块重力;

(2)木块受到的浮力;(3)木块排开水的体积;(4)木块露出水面的体积.8、如图所示,水面上漂有一块体积为2米的浮冰,露出水面的体积为米。求:该冰块受到的浮力。

  33,9、有一体积为1×10千克/米,求:(1).铁块的重力。(2).铁块所受到的浮力。(3).弹簧秤的示数。3-4米3的实心铁块,挂在弹簧秤上后浸没在水中(铁块没有接触容器底部),铁的密度为×、有一密度为,边长为10cm的立方体木块浸在水中,如图5所示,若用对木块的拉力是N,求木块此时受到的浮力?(用三种方法)

  13、一个物块浮在水面上,它没入水中部分的体积是50cm,露在水面上的部分体积是25cm。

  33(1)物块受到的浮力多大?(2)物块的质量是多大?(3)物块的密度是多大?

  14、弹簧秤下挂一个物体,在空气中读数是 N,当物体全部浸入水中时,弹簧秤示数是 N.求:(1)物体受到的浮力;(2)物体的体积;

(3)物体的密度.(g =10 N/kg)

  15、把一个外观体积为的空心铜球放入水中,它恰好处于悬浮状态,已知铜的密度是×10kg/m,g取

  N/kg。求:

(1)空心铜球的重力;(2)铜球空心部分的体积。

  16、用弹簧测力计测石块,其重为9.8N,若把石块的一半浸没于水中,弹簧测力计的读数为7.84N,(ρ10kg/m)则: 3

  3煤油

=×⑴.此石块所受到的浮力是多大? ⑵.这种石块的密度是多少? ⑶.若把石块全部浸入煤油中,弹簧测力计的读数将变为多大?

  17、一艘潜水艇的体积为,其内部水箱的容积是,当它在水下匀速航行时,水箱正好灌满水,此时潜水艇受到的浮力是多少?当潜水艇排完水箱中水时,潜水艇匀速航行时受到的浮力是多少?(海水密度为,23、将边长是10cm的实心立方体木块轻轻地放入盛满水的大水槽内.待木块静止时,从水槽中溢出了600g水,g取10N/kg,求:

(1)木块受到的浮力;

(2)木块的密度;)

  一、计算题

  1、(1)水对容器底部的压强是:p=ρ木块受的浮力是:F=ρ水

  水

  Gh=1×103×10×=5×103Pa………………(2分)gV木=1×103×10×4×10-3=40N………………(2分)(2)最终木块漂浮在水面上时,所受的浮力时:

  F′=G木=ρ水gV木=×103×10×4×10-3=24N………(2分)因为木块浮出水面的过程中,水面下降,所以此时水对容器底的压强比第(1)问中的小…………(1分)

  2、(1)由题意可知F浮=G-F==(2)由图可知,圆柱体刚浸没时下表面距水面距离为 h=12cm= ∵P=gh∴P=1×10kg/m×10N/g×=×10Pa V排g

  4333

  3‘(3)∵F浮=∴V排=F浮/液水g=/1×10×10=×10m

  圆柱体浸没V物=V排 又G=mg=∴物V物g-4

  33=G/V物g=/×10×10=×10kg/m

  3、(1)F浮=G排=(2)G排=ρ水gV排

  浸没时V物= V排=5×10m

(3)因为物体悬浮, 所以ρ盐水-53=ρ物 =m物/V物=/(5×10m)=×10kg/m

  3-、本题要求学生会结合二力平衡知识,用简单公式计算质量、密度、浮力,认真学习的同学都能够做好.难度系数.正确答案:(1)160 kg

(2)800 kg/ m(3)1600N

  5、解:容器中水的积为:V水= SH =×10m, 正方体的体积为VA= L3=×10m。-3

  3-3

  3(1)A受到的浮力为:F浮=ρ水gVA=。设A放入水中后水深为H′,则有

  SH′= V水+VA,所以H′=。

  3此时水对容器底部的压强p =ρ水gH′=×10Pa。(2)初始A浸入水中深度为h0=5L/6=10cm。当绳子刚被拉断时有:Fm+F浮′= G,所以F浮′=。设此时A浸入水中深度为h,则有F浮′=ρ水gL2h。所以h =7cm,Δh = h-h =3cm。

  6、精析 分别对木块所处的几种状态作出受力分析.

  如图3(a)(b)(c).

(a)

(b)

(c)

  图(a)中,木块受拉力F1,重力和浮力.

  图(b)中,细线剪断,木块处于漂浮状态,设排开水的体积为V排

  图(c)中,将露出水面的部分切去后,木块仍漂浮,这时再

  施加F2=1 N的压力,仍有部分体积露出水面.

  已知:F=2N,F=1N,V′=20cm

  3—2×10—

  5m31

  2求:水

  解 根据三个图,木块均静止,分别列出受力平衡过程

  将公式中各量展开,其中V排指图(b)中排开水的体积.

  代入数值事理,过程中用国际单位(略)

  水V—木V=

  水V排—木V

(—5水V排—木V排)=+水

×2×10

  约去V×103

  kg/m3排和V,求得:水=

  答案 木块密度为×103kg/m3

. 7、2400 2400

  8、V3

  排=V物-V露=2米-米=米

  F浮=ρ水 g V排

=×103千克/米3×牛/千克 ×米3

  1分=牛

  1分

  1分 1分

  9、(1).m=ρV =×10千克/米×1×10米=千克

  2分 G=mg =千克×牛/千克=牛

  2分(2).F浮=ρ3水33-43gV排

  3-

  43=×10千克/米×牛/千克×1×10米 =牛

  3分(3).弹簧秤示数为

  F= G-F浮

=牛-牛=牛

  2分 说明:(1)、(3)小题中公式1分,代入与结果1分

(2)小题公式1分,代入1分,结果1分

  10、解法一:根据浮力产生的原因求解 即:

  解法二:根据阿基米德原理求解。解法三:根据木块受到的力求解。

  排

  11、精析 这道题可以用计算的方法来判断,关键是比较两个体积,一是冰熔化前,排开水的体积V,一个是冰熔化成水后,水的体积V.求出这两个体积,再进行比较,就可得出结论. 水

  解(1)如图5(a)冰在水中,熔化前处于漂浮状态.

  F=G 浮冰 水g V=mg 排冰

  V=排

  水

  冰

  冰熔化成水后,质量不变:m=m

  求得:V=水水=排

  比较①和②,V=V

  也就是冰熔化后体积变小了,恰好占据了原来冰熔化前在水中的体积. 所以,冰在水中熔化后液面不变

(2)冰在盐水中:冰熔化前处于漂浮,如图5(b),则

  F 盐浮=G 冰盐水g V排盐=mg 冰

  V排盐=

  冰熔化成水后,质量不变,推导与问题(1)相同.

  V=水

  水

  比较①和②,因为

∴ V=V水排排=盐水

  也就是冰熔化后占据的体积要大于原来冰熔化前在盐水中的体

  所以,冰在盐水中熔化后液面上升了。

  答案(1)冰在水中熔化后液面不变.(2)冰在盐水中熔化后液面上升。

  思考 冰放在密度小于冰的液体中,静止后处于什么状态,熔化后,液面又如何变化?

  12、精析 从受力分析入手,并且知道冰熔化,质量不变,体积减小,造成液面下降。

  已知:S=50cm,h=,h= 21

  2求:冰石

  23石

  解 V+V=Sh=50cm×=230 cm冰熔化后,水面下降h.

  V′=hS=×50cm=22 cm 2

  32∵ m=m 冰水 冰V=冰水V 水 ==,V=水V 冰

  V′=V-V=V-冰水冰V=冰V

  冰

=22 cm 3冰

  V=230 cm—220 cm=10 cm 3

  33石

  冰、石悬浮于水中:

  F=G+G 浮冰石 水g(V+V)=冰石水g V+冰

  水

  G V

  石 石=

=/

  3答案 石块密度为/

  13、(1)(2)(3)/cm

  14、(1) N

(2)×10m

  5(3)×10 kg/m

  15、(1)由空心铜球悬浮在水中可知 V=V=

  3排

  球根据阿基米德原理得:

  F=浮液g V=×10×10××10=

  3-6排

  浮由悬浮条件可知空心铜球的重力 G=F=(2=和G=mg 可知

-6

  3实

  3空心铜球的实心部分体积 V===2×10m=2cm

  空心铜球中空心部分的体积 V=V-V= 空

  实16、1.96N、2.5×10Kg/m、5.88N 3317、(1)(1分)(N)(1分)

(1分)

(2)(1分)(1分)

(N)(1分)

(N)(1分)

  18、(1)(2)

  即:

(3)

  19、(1)(2)

(3)20、21、(1)F浮=G排=ρ

  33-6

  3水

  GV排=×10kg/m×10N/kg×200×10m=2N

  1分

(2)烧杯和水的重力、物体A对水向下的作用力(或物体A受到的浮力)注::回答“烧杯和水的重力”

┉┉┉┉┉┉┉┉1分

  回答“物体A对水向下的作用力(或物体A受到的浮力)”

┉┉┉┉┉┉┉┉1分

  22、分析:A、B分开之前漂浮在水面上,则有上,则有三个方程相减得:解:原情况A、B叠放在一起时,漂浮在水面上,则有:A、B分开后B仍漂浮,A沉入水底,则有: ③

①-②-③得:∴

  23、⑴6N;

⑵×10kg/m

  33;,将A取下投入水中静止后,物体B仍漂浮在水面,以上,而A沉入容器底部受三个力作用,即重力、支持力、浮力。则有

  可求出N。

②,而

⑶600Pa.

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