The second law of thermodynamics is entropy. Things move towards chaos, often in irreversible processes, like burning a piece of paper. F=Ma, D= 1/2at^2 + vit, and other such formulas were things in physics I used to tutor students.
A cold, precise reality, but comforting in their certainty.
Yet people are not like bouncing balls in elastic collisions, where they bounce back up to the original height you dropped them from. Rather, they break.