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The net force is the vector sum of all the forces that act upon an object. That is to say, the net force is the sum of all the forces, taking into account the fact that a force is a vector and two forces of equal magnitude and opposite direction will cancel each other out.
A reaction force is the force applied to a beam or other structure when it rests against. something. In this tutorial we are only going to examine the reactions to the loads acting. on a beam resting on simple supports as shown in the diagram. The loads are point loads. The rests are knife edges.