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我们验证了提出的猜想

2021-06-11 22:27 访问量:发布人:未知

阿基米德突然意识到,浮力与沐浴过程中物体排出的液体的重力有关。 教学过程

指导学生在检查过程中进行实验,为了正确指导,确保每组学生都能得出正确的结论。]

通过本课程的探索,这将对您未来的科学探究猜想产生什么影响?下课后与同学讨论。除了, 说“浮力的大小与液体的密度和排出的液体量有关”是不恰当的吗?然后,与浮力有关的因素有哪些?有什么关系?

(2)体验探索浮力大小的过程,和“与浮力有关的因素”。]

(注意:分享研究成果,使实验结论更具说服力; 同时,不要忽略错误查询过程的介绍,犯错误并及时纠正是人类成长的唯一途径)

经过大家的共同探索我们验证了提出的猜想。浮力可能与物体有关,它也可能与液体有关。

(1)通过探索物体在什么情况下的浮力,识别浮力。与周围物体有关的周围因素:①液体密度; ②多少液体; ③排出的液体量。

指导学生总结知识和技能方面的收获, 工艺和方法, 在这个实验中的情感态度和价值观。探索浮力

(注意:应指导学生对这些猜想进行分析和分类。 首先是增加学生对第一个问题的思考的深度。

(注:这对于提高学生在科学探究中的猜测能力具有重要意义)

将学生分成小组,选择独立探索上述一个或多个猜想,并注意这些因素如何影响浮力

(注意:由于教室时间有限,每个人都只需要随意测量一组数据)

(注意:这是一个非常有价值的问题,这等效于在查询过程中发现新问题。他们的浮力一样吗?为什么?

[学生分为几组,使用不同的物体和不同的液体来定量研究浮力和被驱替液体的重力之间的关系。

通过大家的合作与探索,我们验证了提出的猜想。

(4)在探索浮力过程中学习科学探究的方法,体验科学询问的乐趣。每个人都得出结论,浮力等于物体排出的液体的重力。

在天空中播放巨型帆船和气球的视频,或介绍巨大的船只航行和天空中的气球的照片。

。它与物体的密度和浸入液体中的物体的深度无关。通过实验使学生养成研究问题的习惯)

什么是浮力?您认为在什么情况下物体会漂浮?。 [根据有思想的学生,不难回答。

第二个是为使用弹簧测功机测量浮力铺平道路。教学方法:实验探索法教学辅助容器, 乒乓球(或木制积木), 金属块大烧杯, 弹簧测力计细线, 蛋, 盐, 溢出的小烧杯, 还有很多。避免随机猜测)

学生可能会猜到的因素通常是

(注意:必须强调的是,学生从大量实验中得出的结论是可靠的。 1。可以进一步探索)

(4)作业分配(省略)。

(注意:应引导学生学习比较各种方法的特性,要判断物体是否有浮力,认识到使用弹簧测功机确定物体是否有浮力具有独特的优势)

然后,哪些因素影响浮力?

(注:根据液体的密度,排出的液体量大,液体密度大,置换液体的小物体的浮力可能相同。阿基米德原理

(1)开设新课程

稠密液体中物体的浮力一定很大吗?当物体排出的液体量很大时,物体的浮力一定很大吗?当液体的密度和物体排出的液体的体积不同时,物体可以承受相同的浮力吗?

浸入液体中的物体的浮力等于该物体排出的液体的重力。(黑板)第四, 阿基米德原理

实验过程的典型展示, 实验数据和实验晶体。在全班同学的努力下我们已经解决了一个问题,那是, 明智的阿基米德人已经好几年没有定居了)

(注意:只有学生进行大量的实验转换才是可靠的。在实验室中,我们可以使用弹簧测力计两次测量浮力。大量实验证明,阿基米德原理也适用于气体。发现阿基米德在浴中发现阿基米德原理的轶事。这就是着名的阿基米德原理。每个人都衍生的证据是:浮力的大小与液体的密度和排出的液体的量有关。

由于对象的液体密度和排出的液体量不同时,物体的浮力可以相同。

为了验证浮力是与排出液体的重力相似还是成正比,设计实验如何合适?

(注意:该问题的解决方案应与弹簧测力计测得的浮力进行比较。体验团结的巨大力量)

请猜测与浮力有关的因素,并解释想的依据。

(2)新课教学

In the example we gave,Objects are affected by buoyancy.]

In order to verify whether our guess is correct,How should we design this experiment?(Note: Instruct students to ensure the reliability of experimental results,Control variable)

Knowledge expansion: we study the buoyancy of objects in liquids,Does the buoyancy of the object still affect the object?The buoyancy of gas also affects objects.Because they are all power)

(Note: To remind students,The density of the liquid is different,In various situations,The volume of discharged liquid is also different,Randomly measure the size of buoyancy and gravity to replace the liquid,Then compare)

(3) Know the Archimedes principle. ①The volume of the object; ②The density of the object; ③The depth of the object in the liquid.

Ask a question: Which objects in your life are affected by buoyancy?How do you know it is active?Please give an example.Recognize buoyancy,

[Students usually start guessing from buoyant objects and force-bearing objects liquids. (Examples of improper reporting by students should be dealt with in a timely manner)

(1) Write: 1 on the blackboard.

2.

Please consider:

The density of the object; the immersion depth of the object in the liquid; the density of the liquid; the amount of liquid discharged by the object. apart from, Some students found that in the low-density liquid in the experiment,The buoyancy of the object can withstand a large amount of liquid.Experimental procedure experimental data and typical display of experimental samples. teaching objectives

(Note: Let students summarize and summarize based on the students' full discussion and feelings) In the previous discussion, we know,When an object is immersed in liquid or gas,Will be pushed up by liquid or gas,This force is physically called buoyancy

(2) Write on the blackboard: 2.In order to eliminate mistakes and maintain truth,So that the experimental exploration is more smooth)

(Note: The basis of guessing is to ensure the scientificity of guessing.]

(Note: share research results,Make the experimental evidence at least convincing; at the same time,Don't ignore the display of the wrong query process,Making mistakes and correcting them in time is the only way for human growth)

(3) Writing on the blackboard: 3.

After analysis,We can summarize the above conjectures into the following four:

[Students can start with examples of objects floating or floating in water.

(3) Summary

(Note: Due to limited classroom time,It is not necessary for everyone to make a complete query,(Guide students to understand the importance of cooperation) Instruct students to conduct experiments in the inspection team,Considering the student's choice of conjecture,In order to guide correctly,Make sure that each conjecture has multiple groups of students to verify.]

Will objects that sink in the water float?How do I know if it is buoyant?

(Note: here,Ask the second question.

[Students may guess the buoyancy and quality of the replacement fluid,Gravity is related; buoyancy is approximately or proportional to the gravitational force that displaces the liquid]

Demo picture 1

[Students usually think of various situations,The buoyancy of objects is different.It is not difficult to guess the quality of the discharged liquid,It takes longer to guess the gravity of the dispersing liquid; and the size of the buoyancy is more likely to be related to the gravity of the dispersing liquid.Gradually, Students will realize that objects that sink into the water are also affected by buoyancy

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