Two boxes of masses m and 3m are stacked. (see fig. 4-6.) the surface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. if the less massive box does not slide on the more massive box, what is the coefficient of static friction between the boxes?

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