Free-body diagrams for four situations are shown below. The net force is known for each situation. However, the magnitudes of a few of the individual forces are not known. Analyze . Free-body diagrams are sketches that indicate each and every external force acting on a given object. For the near future, we will treat the object as a point particle and apply each of the . Trusted By Millions · Edit On Any Device · 30 Day Free Trial · Free Mobile AppA Must Have in your Arsenal – cmscritic.