鞋底摩擦力的討論 - 戶外用品
By Candice
at 2019-04-01T12:53
at 2019-04-01T12:53
Table of Contents
要解釋鞋底缺乏摩擦力會打滑,要先了解為何需要需
摩擦力,首先我們先複習牛頓運動定律,當你受的合力為
零,你就會維持原本運動狀態,但當你需要改變運動狀態
就會需要外力,那甚麼叫做運動狀態改變。
第一是速度的改變 F=ma
第二是方向的變化 F=mvv/R
簡單來說根據物理定律來說,甚麼時候需要摩擦力,
以平面運動來說,就是在加減速或是改變運動方向才需要
,因此如果可以用穩定速度朝固定方向前進,是不需要摩
擦力的,所以當你速度控制忽快忽慢就會需要很大的摩擦
力來達成速度的改變,以上討論都是假設腳點是平的,腳
點不平的討論就不在此提出。
我上禮拜雨中練習有快十公里的濕滑石頭路面,這次
我盡量把速度控制穩定,整路幾乎沒有打滑的狀況,以往
為了擔心打滑,會走得忽快忽慢,往往反而更會打滑
簡單整理幾個不打滑重點:
1. 速度要穩定
2. 變換方向要小心
3. 腳點要平
PS 至於動靜摩擦力的比較,就不說明了,會更難懂。
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