Ow does potential decreases when there there is force

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SUMMARY

The discussion focuses on the relationship between potential energy and voltage in the context of electrostatic forces between positive and negative charges. When these charges move closer together, potential energy decreases as kinetic energy increases. The concept of voltage is explained using the capacitor formula, where voltage (V) is inversely proportional to capacitance (C) as charge (Q) approaches. Conversely, separating charges requires work, resulting in an increase in potential difference.

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how does potential decreases when there there is force of attraction between a positive charge and a negative charge
 
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Do you mean potential energy ? It will decrease if they move together by an increase of kinetic energy.
If you mean voltage then think of the pair as a capacitor where C=Q/V or rewritten
V=Q/C as the charges are allowed ( under control) to get closer the capacity gets smaller so the voltage decreases.
Alternatively if you start with the charges very close you are going to do work to separate them -- the definition of potential difference is work done per unit charge so the potential increases on separation.
 

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