Static Equilibrium
The state of a rigid body where both net external force and net external torque are zero, keeping the body completely at rest.
Governing formula
∑ F = 0, ∑ τ = 0
SI unit
N, N·m
In depth
For static equilibrium, translation and rotation are both halted. Structural engineering relies on static equilibrium equations to design bridges and buildings.
Examples in the real world
A suspension bridge carrying heavy traffic without moving or collapsing.