Static Equilibrium

Static equilibrium occurs when an object does not move. It has no linear velocity and no angular velocity. For this state to be reached, the object must in translational and rotational equilibrium. Translational equilibrium occurs when the sum of the forces on an object is zero, and rotational equilibrium occurs when the sum of the torques on an object is zero. These two forms of equilibrium will be applied to uniform rigid objects, to determine the forces and location of forces acting on objects.

Essential Questions

What are the conditions for translational and rotational equilibrium for a rigid object?
How are statics problems solved by analyzing the equilibrium of a rigid object under the combined influence of a number of coplanar forces applied at different locations?

Key Terms

Rotational Equilibrium - The sum of the torque acting on an object is zero.
Translational Equilibrium - The sum of the forces acting on an object is zero.
Static Equilibrium - No net torque or force acts on an object, and it is at rest.

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