The concepts presented in this chapter are summarized below.

Force Equilibrium Summary

The force that is the resultant force of all forces acting on a body is defined as the net force.

If the vector sum of all the forces acting on an object is equal to zero, then the object is in equilibrium.

The first condition of equilibrium is stated as follows: "A body will be in translational equilibrium if and only if the vector sum of forces exerted on a body by the environment equals zero."

Any force or system of forces capable of balancing a system so that the net force is zero is defined as an equilibrant.