Equilibrium point

An equilibrium point is a state in which the net force or torque on a system is zero. Small disturbances may leave it stable, unstable, or neutral.

Newton's laws of motion: Three classical laws relating an object's motion to the forces acting on it. The second law makes zero net force equivalent to zero acceleration.
Force: An interaction that can change an object's motion or deform it. Equilibrium balances forces acting on a system.
Static equilibrium: A condition in which a body remains at rest with both net force and net torque equal to zero. It is the equilibrium condition used for stationary structures and objects.
Dynamic equilibrium: A condition in which a system undergoes motion while opposing effects balance at the macroscopic level. It contrasts stationary mechanical balance with systems that remain in motion.
Torque: The rotational effect of a force, determined by its magnitude, direction, and lever arm. Rotational equilibrium requires the net torque, as well as the net force, to vanish.
Mass: A measure of an object's inertia and its resistance to acceleration. Mass links any residual net force to acceleration.
Mechanical equilibrium: A state in which a system has no unbalanced mechanical forces or torques. It applies force and torque balance to mechanical systems.
Static friction: A contact force that adjusts up to a maximum to prevent relative sliding between surfaces. It can supply the force needed to maintain equilibrium without motion.
Stable equilibrium: An equilibrium state to which a system returns after sufficiently small disturbances. It describes equilibrium points that resist small displacements.
Acceleration: The rate at which an object's velocity changes with time. A system in translational equilibrium has no acceleration from a net force.

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