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the acceleration due to gravity is small on moon why ?

The acceleration due to gravity,g=GM/R^2 where 
G,the gravitational constant.
M,the mass of the object.
R,the radius of the object.
G=6.67x10^(-11)
For moon,M=7.35x10^22kg,R=1.74x10^6m
g=6.67x10^(-11)*(7.35x10^22)/ (1.74x10^6)^2 
=1.62m/s/s.
This is only 1/6th of acceleration due to gravity on earth,9.8m/s/s.


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