<span>The distance between two objects is increased by three times the oringinal distance. Since they were already separated by one time the original distance, the additional three times the oringinal distance now puts them four times the original distance apart.
Whether we're talking about the gravitational forces of attraction or the electrical forces of attraction, either one is inversely proportional to the square of the distance between the objects.
So changing the distance to four times the original distance causes the forces to become 1/4</span>² as strong as they were originally.
The forces become 1/16 of their original magnitude.<span> </span>
<em>For the condition of no slip the force of static friction must be greater than the applied force so that there is no skidding between the contact surfaces at the contact point.</em>
