Newton's First Law of Motion:Inertia : : ? : Equilibrium

Newton’s First Law says that an object’s inertia keeps it moving or at rest unless a force acts on it. In the same way, equilibrium is the state reached when the total force on an object is zero. Thus the missing term that pairs with equilibrium is “force,” because force is what drives a system out of equilibrium. So the analogy reads: inertia : Newton’s First Law :: force : equilibrium. For example, a ball at rest stays still until someone pushes it; the ball’s inertia resists change, and the ball reaches equilibrium when the push (force) is balanced by friction.