In engineering structures, we sometimes encounter flexible cables or chains suspended between two supports at their ends and subjected to the action of vertical load continuously distributed along their length.
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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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.
Next Bucket Elevator http://mechanic-info.blogspot.com/2011/04/bucket-elevator.html
