Torque: A measure of how much a force acting on an object causes that object to rotate, calculated as $\tau = rF\sin(\theta)$ where $\tau$ is torque, $r$ is lever arm distance, $F$ is force, and $\theta$ is the angle between force and lever arm.
Static Equilibrium: A state where an object remains at rest, with both net force and net torque equal to zero.
Lever Arm: The perpendicular distance from the axis of rotation (pivot point) to the line of action of the force.