請問一個有點物理的問題 - 重機
By Dinah
at 2016-02-19T22:47
at 2016-02-19T22:47
Table of Contents
前幾天看到一些國外的研究文章
它好像提到說
一般情況下剎車技術良好的機車可以約可產生負0.7G左右的減速度(負的加速度)
(G是重力加速度 他們用G來當作加速度的單位)
通常技術再好 剎車的減速度 不會比負0.9G更好了
但是又看到一些測試加速性能的文章 使用賽道GPS什麼的
測到瞬間最大加速度可以到1.8G 而且還是馬力不大的機車
這時我就感到很疑惑了
因為不管剎車或加速 都是靠輪胎跟地面的摩擦力
但輪胎跟地面間摩擦力有極限
所以輪胎地面間摩擦力 剎車最大能負荷到0.9G (如果剎車在煞更緊 就打滑了)
這不就表示加速也只能負荷到0.9G 即使你引擎無敵猛爆 輪胎能負荷的極限就是這樣
(因為加速度跟減速度本質是一樣的東西只是方向不同)
超過最大靜摩擦 輪胎就是打滑 無法提供你加速度
所以機車瞬間加速GPS測到1.8G到底合理嗎??
不知道有沒有車友汽車或機車有裝會測量G值的GPS
請問剎車或加速強烈時,G值會到多少啊???能夠超過1G嗎?
而且要產生大於1G的加速度 表示輪胎跟地面摩擦係數要大於1
感覺也不太合理...
不知道有沒有高手或者物理專家可以幫忙說明這個問題~~
萬分感激~~
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Tags:
重機
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