Light

Second Condition of Equilibrium

Definition

The second condition of equilibrium states that for an object to be in rotational equilibrium, the sum of the torques acting on it must be zero. In other words, the net torque acting on an object must be balanced.

Analogy

Imagine a seesaw with two people sitting on opposite ends. For the seesaw to be in rotational equilibrium, the total weight and distance from the fulcrum (lever arm) of one person must balance out the total weight and distance from the fulcrum of the other person. If one person is heavier or sits farther away from the fulcrum, there will be an unbalanced torque causing rotation.

Related terms

Torque: Torque is a measure of how effectively a force can cause an object to rotate. It depends on both the magnitude and direction of the force as well as the lever arm.

Center of Mass: The center of mass is a point within an object where its entire mass can be considered to be concentrated. It behaves as if all external forces are applied at this point.

Rotational Equilibrium: Rotational equilibrium occurs when an object's net torque is zero, meaning it remains at rest or continues rotating at a constant angular velocity.