Mathematically we address, why gravity is a weak force of nature by proposing a force balance equation between classical force (gravity) and quantum force (strong interaction) while presuming that there is a natural balance between these forces. We reported, each side of the balance has two expressions of force where quantum force part consists of two types of quantum force with similar strength but classical force part has a constant force term and gravitational force where this constant force term has large numerical value thus higher weightage in the balance, however, gravity becomes weak itself to strike the balance.
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