Here's a breakdown:
Linear Equilibrium:
* Definition: The object is at rest or moving with a constant velocity.
* Condition: The sum of all forces acting on the object in each direction (x, y, z) must be zero.
* Example: A book resting on a table. The force of gravity pulling the book down is balanced by the normal force from the table pushing upwards.
Rotational Equilibrium:
* Definition: The object is not rotating or is rotating at a constant angular velocity.
* Condition: The sum of all torques acting on the object must be zero. Torque is a force that causes rotation.
* Example: A seesaw with two people of equal weight sitting at equal distances from the fulcrum. The torques created by their weights are balanced.
In summary:
An object is in equilibrium when all forces acting on it are balanced, resulting in no net force or net torque. This means the object will either remain at rest or continue moving at a constant velocity in a straight line.
