图消手则呢薯或其实没图也一样的:P将F力分解,竖直方向为Fsinθ,水平方向为Fcosθ滑动摩擦力=a(Fsinθ+mg)匀速拿棚滑动,即摩擦力=水平分力a(Fsinθ+mg)=Fcosθa=Fcosθ/(Fsinθ+mg)
F*COSa
μ=mg/Fcosθ
N=Fsin&+mgf =miuN=miu(Fsin&+mg)=Fcos&miu=Fcos& |(Fsin&+mg)