Shear Force Diagram: 45N at 0.6m from B vs. 0.5m from D - Homework Question

AI Thread Summary
The discussion centers on the placement of a 45N force in a shear force diagram, specifically questioning its representation at point D versus point E. Participants clarify that the force should be depicted at 0.6m from D, not B, as the beam experiences forces at the attachment point. The importance of equilibrium in the system is emphasized, noting that reactions must occur at the point of connection to the beam. The confusion arises from the graphical representation, with suggestions to draw a free-body diagram for clarity. Accurate placement of forces is crucial for understanding the shear force diagram.
chetzread
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Homework Statement


In this question , the 45N is acting at 0.6m from B ...
why the author put the 45N forces at D in the shear force diagram ? Is it wrong ?

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The Attempt at a Solution


IMO , the 45N should be put at 0.5m from D . Correct me if i am wrong
 

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chetzread said:
In this question , the 45N is acting at 0.6m from B .
Looks to me that it is 0.6m from D and 0.9m from B.
 
haruspex said:
Looks to me that it is 0.6m from D and 0.9m from B.
sorry , i mean the 45N is acting at 0.6m from D .
Why , in the diagram , the author' bring down' the graph by 45kN at point D ? the graph should go down by 45kN at E ( which is 0.6m from D ) , right ?
 
It may help to draw a free-body diagram of just the "handle" attached at D. For equilibrium to be satisfied in the handle, what is the force and moment required to act on the handle at the point where it connects to the beam? Once you determine this, recall that equal and opposite reactions must act on the beam from the handle.
 
chetzread said:
sorry , i mean the 45N is acting at 0.6m from D .
Why , in the diagram , the author' bring down' the graph by 45kN at point D ? the graph should go down by 45kN at E ( which is 0.6m from D ) , right ?
Same issue as in the other thread. The beam feels the forces and moments at the point of attachment, D.
 
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