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Based on this and the equation F = -d[itex]\Phi[/itex]/dr. I can't visualize what is positive and negative force direction (what is positive direction). So is that just mean whenever the force between 2 molecules (+), it's repulsive; and whenever it's (-), it's attractive? Thanks for checking this out.

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# Lennard-Jones potential graph w/ attractive/repulsive force

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