How do you lift this huge rock? With a simple machine like this lever. Jeff steps on one end of the lever, pushing down and the
rock is lifted up. What is the mechanical advantage of using this
lever?

the force on the thing and the distance the force moves the thing

the displacement produced by the body.  

the amount of force subjected to the body.  

the angle between the direction of force and displacement

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

there are no atoms