Static equilibrium

Static equilibrium is a state in which a body has zero linear and angular acceleration. The net force and net torque on it are both zero.

Newton's laws of motion: Three laws that relate an object's motion to the forces acting on it. The first law describes motion when the net force is zero.
Force: An interaction that can change an object's motion or deform it. Equilibrium requires all external forces to sum to zero.
Structural analysis: The study of forces, stresses, and deformation in structures under loads. Static balance is the starting point for calculating structural reactions.
Dynamic equilibrium: A state in which opposing processes balance while a system continues to change. It can involve ongoing change, unlike a body at rest in static equilibrium.
Torque: A measure of how strongly a force tends to rotate an object about an axis or point. Zero net torque prevents angular acceleration in equilibrium.
Angular acceleration: The rate at which an object's angular velocity changes over time. Static equilibrium requires angular acceleration to vanish.
Truss: A framework of connected members arranged in triangular units to carry loads. Its members are analyzed by enforcing force balance at joints.
Mechanical equilibrium: A condition in which a system has no unbalanced force or torque. Static equilibrium is its zero-velocity case for a body.
Center of mass: The weighted average position of the mass in a body or system. Net force determines the center of mass's linear acceleration.
Linear acceleration: The rate at which an object's velocity changes over time. Static equilibrium requires linear acceleration to vanish.

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