| Couple |
A pair of forces equal in magnitude, opposite in direction, and parallel but not collinear, causing rotation without translation. |
| Equilibrium |
The state in which the sum of clockwise moments is equal to the sum of counterclockwise moments around a point. |
| Lever Arm |
The perpendicular distance between the line of action of the force and the axis of rotation. |
| Moment Arm |
Same as lever arm, the distance from the axis of rotation to the line of action of a force. |
| Moment Center |
The point about which moments are calculated, often chosen for convenience. |
| Moment Of A Force |
The product of the force and the perpendicular distance from the line of action of the force to a reference point. |
| Torque |
A measure of the rotational effect of the force, calculated as the moment of force multiplied by the length of the lever arm. |
