Re: [問題] 請問公路車換刀輪適合嗎??
推 WuDhar :我那張圖也可以改成這樣 http://tinyurl.com/kumcby2 04/23 04:03
→ WuDhar :@c,我重輪轉動能也是起步灌進去的,能量哪裡沒守恆 04/23 12:54
→ WuDhar :輕輪只是把能量先拿去吃風換距離優勢而已 04/23 12:54
這真的就搞笑了
按你的圖,你解釋慣性小輪組在前段速度較快,所以耗掉較多風阻能
慣性大的輪組則是先存成轉動能
好~我同意
但是呢?
後半段停止踩踏到維持回原速度那段區間,慣性大的輪子降速少(速度反而高)
所以這時不是變成慣性大的輪組比慣性小的輪組消耗更大的風阻能?
重複幾次後,這一來一往間不就抵銷了,有啥優勢?
再對照你前面講法:距離夠遠就有優勢,真的嗎?
這樣停止踩踏的區間越多次,慣性大的輪組反而比慣性小的輪組消耗更多風阻能耶
既然要考慮不同速度下的風阻
那速度對時間的圖理應會變這樣 http://ppt.cc/M385
紅色是慣性小,藍色是慣性大,兩者都是從時間0到t之間等力(也就是做功相等)
積分一下,A跟B的面積相等,所以紅色跟藍色圍的面積一樣代表跑一樣遠
所以你說的滑更遠是怎麼回事?
再來,紅色慣性小的先滑完捏,同距離下先滑完,不就是平均速度較高嗎?
到底是誰物理不好XD
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