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一、教材原题题目:苏科版物理八下教材P90,第4题:如图1所示,从漏斗口向下吹气,乒乓球会掉下来吗?请解释其原因.现象:乒乓球不会掉下来.分析:本图考查了流体压强与流速的关系,看学生能否将所学知识灵活运用到实际生活中,学以致用的能力.解:从漏斗口向下用力吹气时,乒乓球上部空气流速大、压强小,而乒乓球下部空气流速小压强大,这样在乒乓球的上、下部就会产生一个向上的压力差,从而托起乒乓球.延伸:若从漏
First, the textbook The original title: Su Ke version of physics eight under the textbook P90, Question 4: As shown in Figure 1, blowing down from the funnel mouth, the table tennis will fall? Please explain the reason. Will not fall.Analysis: This chart examines the relationship between fluid pressure and flow rate, to see whether students can apply what they learned in real life, learn from the ability to use. Solution: forced down from the funnel mouth blowing , The upper part of the table tennis air velocity, pressure is small, and the lower part of the table tennis air velocity small pressure, so that the upper and lower parts of the table tennis will produce a pressure difference upwards, so as to hold the table tennis.