1.如图:将重力G分解,当没摩擦力时,合力就等于mgsina
a=mgsina/m =gsina
当有摩擦力时,F合=mgsina-f
f=μN = μmgcosa
a=F合/m = gsina-μgcosa
2. S=1/2 *at^2
t = √2S/a = √2S/(gsina-μgcosa)
1.如图:将重力G分解,当没摩擦力时,合力就等于mgsina
a=mgsina/m =gsina
当有摩擦力时,F合=mgsina-f
f=μN = μmgcosa
a=F合/m = gsina-μgcosa
2. S=1/2 *at^2
t = √2S/a = √2S/(gsina-μgcosa)