The gravitational unit of force is Kgf.
According to Newton’s universal law of gravitation, the force of attraction between any two bodies is directly proportional to the product of their masses and is inversely proportional to the square of the distance between them.
The kilogram force (kgf) is a gravitational unit of force. The force exerted by the earth on a body of mass 1 kg is regarded as 1 kgf.
Force = Mass × Acceleration
1 kgf = 9.8 N