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The repulsive component acts over a relatively short distance, r, from the object, but it has a relatively large magnitude when r gets small. The negative part of the curve that moves further away from the vertical axis represents the force of attraction. Here, the magnitude of the force is smaller but it acts over a much greater range of separation, r.

You can change the slope of the potential or force curve by adjusting the n and m parameters. This enables you to adjust the range over which repulsion or attraction dominates and affords some control over the point of transition. You can think of A and B as the strength of the attraction and repulsion forces, respectively, whereas the n and m represent the attenuation of these two force components.