推荐回答(6个)
这个问题很有意思
你想像一下一个车没有顶和墙,只有个平板,以时速200公里/小时飞驰,坐在上面是什么感觉?人不被刮死也被吓死了。
你说的苍蝇会向后退的情况,车其实是这样的。空气相对地面静止,相对车向后飞驰,苍蝇相对空气静止,也相对车向后飞驰。
这里有个不好理解的地方。一般下意识的认为车都不会密闭特别严,特别是开了很多窗的车,而且空气的流动性很强,所以车不会把车内的空气带着向前跑,只有放在车上的跟车之间有很大摩擦力的物体才会被车带着向前跑。其实空气流动性虽然强,车虽然不严,但空气密度小,质量小,惯性小,所以也是很容易跟这车跑的。
如果想透了,车内空气跟车是相对静止,苍蝇不会后退就容易理解了,应为苍蝇不论怎么飞都是相对车内空气,而不是车外空气。
题目给出的条件不够明确,无法确定苍蝇的飞向。
当苍蝇在车内飞行中,且与车是保持静止的,那么开车时,苍蝇的反应会与坐在车内的乘客一样,先是后仰,再恢复原状。
当苍蝇在车内飞行中,与车外空气保持静止,且车内空气与车外空气相对联通,当车开动时,苍蝇相对车来说会往后方移动。
当苍蝇在车内飞行中,与车开动的速度一致,且车内空气与车外空气相对联通,当车开动时,苍蝇相对车来说它是静止的(当然这个过程很短,要保持这个过程也不容易^_^)。
不会,苍蝇和车处于同一惯性系中,会相对静止。就象苍蝇飞行速度远不如地球绕行太阳的速度,但苍蝇还是能安然呆在地球上。
不会,因为车上的空气和车具有相同的速度
空气相对于车静止
所以苍蝇不会随着车的移动与移动
你必须首先清楚,人为什么会随着车的移动而移动?本来人坐在车上,相对于车是静止的,应该不会因车子的移动而移动;但是人具有惯性,当车子改变运动状态时,根据牛顿第一定律,具有惯性的人会保持原来的运动状态不改变。举个例子:车子忽然刹车,你是不是向前倾呢?因为你还保持着原来向前运动的状态。
但是苍蝇不一样啊!它本来就和车子没有接触,自然也谈不上与车的运动状态有什么联系。苍蝇的飞行与车子的运动无关。
完全可以,苍蝇是可以随便飞的,哈哈,车前进时,它可以快速向后飞,没有问题!
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