Concept explainers
Draw and label a free-body diagram for system C.
Compare the forces that appear on your free-body diagrams for system C to those that appear on your diagrams for system A and B in section II.
For each of the forces that appear on your diagram for system C, list the corresponding force (or forces) on your diagrams for system A and B.
Are there any forces on your diagrams for system A and B that you did not list? If so, what characteristic do these forces have in common that none of the others share?
Why is it not necessary to consider these forces in determining the motion of system C?
Note that such forces are sometimes called internal forces, to be distinguished from external forces.
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