重力G=mg=65kg×10N/kg=650N 一只脚与地面的接触面积 S=170cm²=170×0.0001m²=0.017m²人站立时对地面的压强p1=F/S=G/S=650N/0.017×2m²=19117.65Pa走路时对地面的压强p2=2×p1=2×19117.65Pa=38235.3Pa
