英语翻译
问题描述：
英语翻译
A dock worker loading crates on a ship finds that a 12 kg crate,initially at rest on a horizontal surface,requires a 69 N horizontal force to set it in motion.However,after the crate is in motion,a horizontal force of 54 N is required to keep it moving with a constant speed.
The acceleration of gravity is 9.8 m/s2 .Find the coefficient of static friction between crate and floor.
Find the coefficient of kinetic friction.
答
工人发现装载在船上箱子重12kg,最初静止在水平表面上,需要 69 N 的水平力使他移动.然而,箱子都在运动后,54 N的水平力就能使他匀速移动.
重力加速度的是 9.8 m/s2.求到箱子和地板之间的静摩擦系数.Find the coefficient of kinetic friction.求动摩擦系数