初速度为0,加速度为a的匀加速运动,摩擦力f,动摩擦因数u
s = (1/2)att,
f = ma,
w = fs.
2.4 = (1/2)* a * 1.2 * 1.2 ,a = 10/3,
f = ma = 2.5 * 10/3=25/3
动摩擦因数 u = f/mg=a/g=1/3
w = fs =(25/3)*2.4=20J
初速度为0,加速度为a的匀加速运动,摩擦力f,动摩擦因数u
s = (1/2)att,
f = ma,
w = fs.
2.4 = (1/2)* a * 1.2 * 1.2 ,a = 10/3,
f = ma = 2.5 * 10/3=25/3
动摩擦因数 u = f/mg=a/g=1/3
w = fs =(25/3)*2.4=20J