- Tension - Tension is when something is in the state of being stretched or bent.
- Torsion - Torsion is a turning or twisting force.
- Stress and release - Stress and release is the relationship between applying a force and easing/lessening a force.
- Equilibrium - Equilibrium is a stable state. It is usually characterized by the cancellation of all forces by equal opposing forces. This can be similar to balance in that the forces are "balanced."
Stress and Release (of tension):