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Force is the cause of the acceleration of a body. The SI unit of force is the Newton [N]. 1 Newton is equal to the force that causes a body of mass 1 kg to accelerate 1 m
The (inertial) mass of a body is the cause of its resistance to acceleration.
The (heavy) mass is the cause of the attraction or gravity. The inertial and heavy mass of a body are equal... The unit of mass is the kilogram. The kilogram is one of the seven base units of the SI system of units. All other units are derived from the base units. 1 kg is equal to the mass of the international kilogram prototype in Paris.
The Anglo-American units gram-force [gf], kilogram-force [kgf], ton-force [tf], pound-force [lbf] and kilopound-force [kip] correspond to the forces acting on a body of the respective mass act as a "weight" in the earth's gravity field. The weight FG is proportional to the mass m. The proportionality factor g is called gravitational acceleration and is 9.80665 m
The kilopond was one of the three basic units of the technical system of units. The technical system of units has not been permitted since 1977. The kilopond and the pond corresponded to the weight forces of a kilogram or gram in the earth's gravity field. The notation for the weight of a kilogram is therefore 1 kg · 9.80665 m
A poundal is the force that corresponds to 1 pound with 1 feet