Answer
$9.81N=0.00981kN=9.81\frac{kg*m}{s^2}=1kgf=71\frac{lbm*ft}{s^2}=2.21lbf$
Work Step by Step
Knowing that:
$W=mg$
$W=1kg*9.81\frac{m}{s^2}*\frac{1N}{1\frac{kg*m}{s^2}}=9.81N$
$W=1kg*9.81\frac{m}{s^2}*\frac{1kN}{1000\frac{kg*m}{s^2}}=0.00981kN$
$W=1kg*9.81\frac{m}{s^2}=9.81\frac{kg*m}{s^2}$
$W=1kg*9.81\frac{m}{s^2}*\frac{1N}{1\frac{kg*m}{s^2}}*\frac{1kgf}{9.81N}=1kgf$
$1kg*\frac{2.205lbm}{1kg}=2.205lbm$
$W=2.205lbm*32.2\frac{ft}{s^2}=71\frac{lbm*ft}{s^2}$
$W=2.205lbm*32.2\frac{ft}{s^2}*\frac{1lbf}{32.2\frac{lbm*ft}{s^2}}=2.21lbf$
