沪科版八年级物理第八章第四节流体压强PPT课件

.,1,八年级物理,第八章,第四节流体压强与流速的关系,梁山县马营乡中学,Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile.Copyright2004-2011AsposePtyLtd.,.,2,为什么人不能站在安全线以内？,Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile.Copyright2004-2011AsposePtyLtd.,.,3,1912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，彼此靠得较近，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的，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,Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile.Copyright2004-2011AsposePtyLtd.,.,4,Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile.Copyright2004-2011AsposePtyLtd.,.,5,流体压强与流速的关系,Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile.Copyright2004-2011AsposePtyLtd.,.,6,自主研学评价,2、以下几个有趣的小实验，你做了吗？观察到什么现象？能解释原因吗？,1、何谓流体？,Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile.Copyright2004-2011AsposePtyLtd.,.,7,吹气,吹气,向小船中间注水,向火焰中间吹气,Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile.Copyright2004-2011AsposePtyLtd.,.,8,Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile.Copyright2004-2011AsposePtyLtd.,.,9,流速快气压小,Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile.Copyright2004-2011AsposePtyLtd.,.,10,球不掉下的原因,Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile.Copyright2004-2011AsposePtyLtd.,.,11,结论气体压强与气体流速有关,气体在流速大的地方压强较小;反之,在流速小的地方压强较大.,液体压强与流速的关系与气体的是否一样哪？,请仔细观察形象演示,Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile.Copyright2004-2011AsposePtyLtd.,.,12,静止时:,流动时:,Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile.Copyright2004-2011AsposePtyLtd.,.,13,Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile.Copyright2004-2011AsposePtyLtd.,.,14,1请仔细观察演示实验：看两瓶盖（两船）怎样运动,2解释该现象,Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile.Copyright2004-2011AsposePtyLtd.,.,15,中间注水,船,Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile.Copyright2004-2011AsposePtyLtd.,.,16,请同学们讨论总结流体压强与流速的关系,流体压强与流速的关系：流速大的位置压强小，流速小的位置压强大,Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile.Copyright2004-2011AsposePtyLtd.,.,17,小鸟凭什么在空中飞呢？,想一想、议一议,你知道飞机靠什么升空吗？,Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile.Copyright2004-2011AsposePtyLtd.,.,18,飞机的升力的由来?,Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile.Copyright2004-2011AsposePtyLtd.,.,19,Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile.Copyright2004-2011AsposePtyLtd.,.,20,上方流速快，压强小,下方流速慢，压强大,飞机获得升力的原因,Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile.Copyright2004-2011AsposePtyLtd.,.,21,战斗机：利用“”升空,机翼获得的升力,Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile.Copyright2004-2011AsposePtyLtd.,.,22,水翼船,Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile.Copyright2004-2011AsposePtyLtd.,.,23,谈谈你的收获。,小结：,Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile.Copyright2004-2011AsposePtyLtd.,.,24,课内达标,1在地铁或火车站台上等候车辆时，要求乘客要离开站一米以上，其主要原因是（）A车辆过来时风太大B车辆过来时，带来好多飞尘C车辆驶过站台车速快，带动空气流速加快，使人易“吸”向车辆，造成危险D车辆驶过站台车速快，使人与车之间空气流速加快，易将人吹向后倒地,2秋天树叶落在路面，当一辆高速行驶的汽车驶过时，路旁的树叶（）A从路旁吸向汽车B从路中间飞向路边C不受影响D只向上飞扬,C,A,Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile.Copyright2004-2011AsposePtyLtd.,.,25,能力提升,1刮大风的天气，我们在上学的路上如果迎风走路或骑车一阵大风刮来时，我们无法用嘴或鼻子吸空气，但可以向外吐气,当这阵风过去又恢复正常呼吸，其原因是什么？,Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile.Copyright2004-2011AsposePtyLtd.,.,26,2、相信大家都有过这样的经历：步行在雨中，我们会打一把伞一阵大风吹来，雨伞会被向上吸起来这是为什么呢？你能不能用今天所学的知识解释这个现象呢？,Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile.Copyright2004-2011AsposePtyLtd.,.,27,草原犬鼠洞穴的空调系统,吹过平坦表面的风运动速度小，压强大,吹过隆起表面的风流速大，压强小,A,B,A,B,Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile.Copyright2004-2011AsposePtyLtd.,.,28,作业,Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile.Copyright2004-2011AsposePtyLtd.,.,29,汽车尾翼气流偏导器的作用,分析：,E