Force
In physics, a force is any interaction that, when unopposed, will change the motion of an object. A force can cause an object with mass to change its velocity (which includes to begin moving from a state of rest), i.e., to accelerate. Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity. It is measured in the SI unit of newtons and represented by the symbol F.
Kilogram-force
It is also used for tension of bicycle spokes, for informal references to pressure in kilograms per square centimeter (1 kp/cm) which is the technical atmosphere (at) and very close to 1 bar and the standard atmosphere (atm), for the draw weight of bows in archery, and to define the "metric horsepower" (PS) as 75 metre-kiloponds per second. In addition, kilograms force is the standard unit used for Vickers hardness testing.
The tonne-force, metric ton-force, megagram-force, and megapond (Mp) are each 1000 kilograms-force.