騎自行車下坡後,變為低速後為什麼會有踏空的感覺? - 自行車
By Puput
at 2006-05-06T00:00
at 2006-05-06T00:00
Table of Contents
騎自行車從高處下來後,速度會變得愈來愈快,這時後如果是在高速檔,騎的話還要在花點力氣,而且可以愈騎愈快;但如果變為低速檔後,騎的時後會有踏空的感覺,好像只是在繞圈子,沒有像一般在平地騎的時後,還有些阻力,而且速度不會變快,為什麼?(如果可以的話,可以順便說一下是什麼樣的構造導致的嗎?)
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自行車
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