How does the pendulum to illustrate the conservation of energy?

When the pendulum is at it's highest point of it's swing, the pendulum is momentarily motionless as it changes direction. At this point, the pendulum has ZERO kinetic energy, and the most potential energy. When the pendulum is swinging down again, that potential energy is coverted into kinetic energy.

Since the energy is being converted, not created, the swinging pendulum illustrates the law of consevation of energy.

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