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a bit confusin indeed, one should distinguish between the force itself and the potential field, furthermore the point, the force is acting to or from, is not in every case the origin, this is just a special case.
According to Classical Mechanics by Goldstein, page 7, a central force is one where the direction of the force lies along the radius vector. Similarly, page 88 in Theoretical Physics by Georg Joos says that a central force is one whose representative vector always points towards a fixed point O. This does not mean that the magnitude of a central force is a function of the magnitude of it's position vector r.
220.127.116.11 22:09, 16 April 2007 (UTC) physics dude
Central forces do not exist in nature.
The central force problem is a simplifying approximation to the two body problem.
Central forces are non-physical, they violate the law of conservation of momentum.
Gravity and Electrostatic forces are is not examples of a central force. The gravitational force depends on the distance between the objects, not the distance of the objects to the barycenter. —Preceding unsigned comment added by Norbeck (talk • contribs) 05:23, 12 May 2010 (UTC)