[游戏]
一个男孩坐在一辆篷布覆盖的卡车车斗里，卡车行驶时，他奇怪地看到，尽管篷布的后面是开放的，几只苍蝇在篷布下仍然安详地旋转飞舞着。他想，这些苍蝇是否正在以卡车的同样速度在飞行？
[原理]
其实，尽管后面是开放的，但卡车的车斗这时仍然是一个封闭的空间，这里的空气是静止的。甚至连外边迎面刮来的风，都不能吹入车厢。苍蝇在这里就和在一个房间里一样。但如果风从篷布前面的一个缝隙中吹进来，苍蝇就抵挡不住了。
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