Equilibrium
- A system is in equilibrium when all the forces are balanced. This means:
- There is no resultant force
- There is no resultant torque
- An object in equilibrium will therefore remain at rest, or at a constant velocity, and not rotate
- The system is in an equilibrium state when applying the principle of moments (see The Principle of Moments)
Worked example
Four beams of the same length each have three forces acting on them.Which beam has both zero resultant force and zero resultant torque acting?