This is a minor point about springs, but since we have defined a rest length, in the case where the distance between the two points becomes less than the rest length, the force itself will turn negative. This will make the points want to expand (instead of contract in the traditional case).
This is a minor point about springs, but since we have defined a rest length, in the case where the distance between the two points becomes less than the rest length, the force itself will turn negative. This will make the points want to expand (instead of contract in the traditional case).