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在无风的日子里,我们慢慢地骑自行车前行,感觉不到空气的阻力;而快速骑自行车时,我们就会感到空气的阻力,而且骑车速度越快,感觉空气阻力越大。【提出问题】运动物体受到的空气阻力与物体运动速度的大小有怎样的关系呢?【猜想】小明由生活经验猜想到:物体所受空气阻力大小与物体运动的速度大小有关,且运动速度越大,空气阻力越大。【设计实验】为了验证自己的猜想,小明设计了如下的实验:
During the windless days, we slowly ride a bike forward and feel no air resistance. When we quickly ride a bicycle, we feel the air resistance. And the faster we ride, the more air resistance we feel. [Ask questions] What is the relationship between the air resistance of a moving object and the speed of the moving object? [Conjecture] Xiao Ming’s guess of life experience is that the amount of air resistance suffered by an object is related to the speed of the moving object. Large, the greater the air resistance. Design experiment In order to verify their own conjecture, Xiao Ming designed the following experiment: