In which circumstance is displacement the same as distance traveled?

Well, they can never really be "the same", because displacement is a vector and distance is a scalar.

But distance and displacement can both have the same size. That happens when the travel is all in a straight line.

close lines strong magnet less close weaker

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force