In this problem, we'll identify the forces acting on an object and the relationship between the forces.

**a.**

We'll use "u" for upward forces and "d" for downward forces for the forces between links

The forces on the system are:

-The rope pulls the system upward (T)

-Link three exerts a downward force on the system (F_{3d})

Let S_{12} represent the system consisting of links 1 and 2 of the chain in problem 2 (i.e., treat links 1 and 2 as a single object).

a. In the space at right, draw and label a free-body diagram for system S_{12}.

b. Compare the forces that appear on your free-body diagram for system S_{12} to those that appear on your diagrams for links 1 and 2 in problem 2.

i. For each of the forces that appear on your diagram for system S_{12}, list the corresponding force (or forces) on your diagrams for links 1 and 2

ii. Are there any forces on your diagrams for links 1 and 2 that you did not list? If so, what characteristics do these forces have in common that none of the others share?

c. Let C represent the system consisting of the whole chain. Draw and label a free-body diagram for C. Make sure that your diagram is consistent with the reasoning you used in part b.

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