What type of force is not typically considered within the definition of resultant forces?

Resultant forces are defined as the single vector that represents the cumulative effect of all the forces acting on a body. Within this context, when considering the various types of forces, equilibrant forces are not typically included in the definition of resultant forces.

An equilibrant force is specifically the force that is equal in magnitude and opposite in direction to the resultant force. Its purpose is to bring a system to a state of equilibrium, effectively neutralizing all other forces to prevent motion. Therefore, while resultant forces summarize the overall effect of all acting forces, equilibrant forces serve a different function and are not part of the resultant calculation.

In contrast, vector forces, single forces, and combined forces all relate directly to the definition and computation of the resultant force, as they involve the combination and summation of various force vectors.