This free body is in equilibrium under the action of three force; a vertical force Q representating that portion of the distribution load between point C and D as a picture and two tensile forces H and S representating the reactions exerted by the unconsidered portion of the chain on either side.
The force H and S are tangent to the curve at C and D respectively and the vertical force Q acts through the centroid of that portion of the load diagram between these same two points. Since the three forces must build a close triangle as picture describe.


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