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澧兰
1.
14.4 流体的压强与流速的关系
2.
14.4 流体的压强与流速的关系
3.
4.
这次空难事件中,舱内 外的气压差是如何形成的? 猜一猜
5.
流体压强与流速的关系 合作探究 方案一
方案二 方案三 方案四
6.
请同学们手握两张纸,让纸自然下垂,在两张纸中间向下吹气。 不吹气时,纸条两侧空气可近似看作静止,两侧空气对纸条作用的压强相等,气压不会引起纸条运动。
吹气时,纸条接触气流的一侧受到的气压比静止空气的气压小,结果纸条在两侧气压差的作用下,向气压小的一侧(有气流的一侧)运动。 分析论证 吹气
7.
结论: 流体流动时,流速越大的位置压强越小,流速越小的位置压强越大。 分析论证
8.
1 、看看实验方法或实验过程是否存在有缺陷,需要做何改进? 2
、是否还有其他实验方案? 评估与交流
9.
辨一辨 应用与创新 1912
年秋天, " 奥林匹克 " 号正在大海上航行,在距离这艘当时世界上最大远洋轮 的 100 米处,有一艘比它小得多的铁甲巡洋舰 " 豪克 " 号正在向前疾驶,两艘船似乎在比 赛,彼此靠得较拢,平行着驶向前方.忽然, 正在疾驶中的 " 豪克 " 号好像被大船吸引似 地,一点也不服从舵手的操纵,竟一头向 " 奥林匹克 " 号闯去.最后, " 豪克 " 号的船头撞 在 " 奥林匹克 " 号的船舷上,撞出个大洞,酿成一件重大海难事故.
10.
辨一辨 应用与创新 这次海难事件发生的原因与今天所学的知识有关吗?假如你是一名船长,你会从这次海难事件中吸取到什么教训?
11.
气流偏导器 应用与创新 辨一辨
仔细观察它的形态,并说出这种设计的好处在哪里?
12.
应用与创新 辨一辨 草原犬鼠的空调系统
下图是非洲草原犬鼠洞穴的横截面示意图,犬鼠的洞穴有两个出口,一个是平的,而另一个则是隆起的土堆,生物学家不是很清楚其中的原因,请你根据今天所学知识解释,并在图中标出洞穴中空气流动的方向。 A B
13.
飞 行 表
演
14.
飞 行 表
演
15.
比较机翼与鸟儿翅膀的形状 应用与创新 想一想
16.
飞机机翼升力产生的原因 飞机在机场 跑道上滑行时迎
面吹来的风被机 翼分成两部分, 由于机翼横截面 形状是 上面凸起 、 下面平直 ,在相同的时间里机翼上方气流通过的路程长, 流过机翼上方的空气速度快,流过机翼下方的空气速度慢, 机翼上下表面由于流速不同产生压力差形成向上的升力 。
17.
应用与创新 想一想 一、你觉得飞机顺着风起飞好,还是逆着风起飞好?
二、你认为气流偏导器与机翼的形状有何区别? 三、如果想使轮船的航行速度更快、载重量更大,你该对其做何改进?
18.
水翼船是一种高速船。船身底部有支架,装上水翼。当船的速度逐渐增加,水翼提供的浮力会把船身抬离水面(称为水翼飞航或水翼航行 ) ,从而大为减少水的阻力来增加航行速度。
水 翼 船
19.
普通烟囱 改进烟囱
20.
谢谢指导
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