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The ____________ forces are used for the making of the free body diagram of the beams so as to apply the method of sections.

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The ____________ forces are used for the making of the free body diagram of the beams so as to apply the method of sections.

(a) Internal rotational

(b) Couple rotational

(c) Translational

(d) External

I have been asked this question in homework.

The query is from Internal Forces Developed in Structural Members in section Internal Forces of Engineering Mechanics

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Right choice is (d) External

Explanation: The free body diagram is using the external forces which are acting on the beam as the main purpose is to design the beam. Design so as to withstand the loads which are going to be added to the beams. Thus the loads which are being added externally are being used in the free body diagrams.

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