推荐回答(5个)
你没有理解地球和地球上的一切都在一个惯性系中,包括空气,都随着地球在转,你向上跳,会落回起跳的地方而不是向后一点。你还有一个错误是关于惯性会消失,你要明白力是改变物体运动状态的原因,悬浮的热气球无风时会受到水平方向的力吗?不会的,因为空气也随着地球在转,相对于地面是静止的,气球自然会与地面同步运动。
“五楼的,您好,您回答的很好,人在地球上网上跳会落到原点这是常理,惯性不会消失,但是在空气阻力下也会消失,那在一个高速转动的大球体里面,放一个热气球,当过段时间热气球落下来后会回到原点吗? ”
我就是原来5楼的,现在继续回答你:
这个问题和地球上悬浮的气球不一样,地球引力垂直向地心,不会对物体水平方向的运动造成影响,而高速旋转的球体内气球受到的引力是啥方向?
假如气球是从火车的外面飘进来的,气球会怎样? 他们不属于一个惯性系,从外面飘进的气球刚进来时由于惯性会保持原先运动状态,相对于火车内的空气时运动的,但由于空气阻力,相对火车运动速度会减慢直至与火车同步。
假如人站在一个快速度转动的大转盘上网上跳,人还会落到原点吗? 不会回到原点,跳起来时,人会沿着人所在圆弧的切线方向水平运动,人原来站的点沿圆弧方向运动,不会落回到原点。这个和地球自转的情况也不一样,人在地球上跳起时,地球引力竖直向下,对水平方向运动无影响,而站在大园盘上时,人由于圆弧运动需要的向心力由摩擦力提供,指向圆心,而跳起时这个摩擦力就不在了,明白吗?
你忽略了空气对物体的作用,悬浮在空中的物体还要受到空气的作用。
另外关于证明地球自转,有一个方法和你想的类似。叫高空自由落体偏东。如果在高处释放一个物体,让它做自由落体运动,因为在高处物体随地球自转的线速度要大于低处的,因此如果不考虑风的作用,那么该物体将落在正下方的偏东位置上,但这需要物体从很高的地方落下才会看出来。
看了提问内容,愕然啊!
1,“那假如我门坐着热气球在地面上停留个三两天,那时惯性基本上没了,甚至可以省略”,你以为惯性是“牵动”?
2,“假如跳的高一些,就会离原点更后”那是你斜着跳。
3,“假如在火车上放一个氢气球,会怎样?很明白,”很不明白才是。难道没风吹?空气没阻力?
4,“那我门看到的情况应该是地面也在旋转,而事实上却没有,”你坐过热气球吗?
5,碰到这类问题,很无奈,因为答案的对错已不重要。恐怕提问者也不因对错而选择最佳。
“假如我门坐着热气球在地面上停留个三两天,那时惯性基本上没了”
惯性是物质本身所具有的属性,惯性的大小有物质的质量决定,质量越大,惯性越大。
什么叫惯性没了?
小朋友啊,物理没学好别根据自己的主观想法乱想。。。省省吧。
晕`
楼主``你在说什么呢`
我比例给你看`
你用望远镜``摆到那颗星星的位置`
然后`你过几个钟头`在来看`我保证那颗星星会跑```
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