Frame and Machine (engineering mechanics statics)

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Discussion Overview

The discussion revolves around the challenges of drawing free body diagrams (FBDs) in the context of a problem related to engineering mechanics statics, specifically involving a pulley and a rigid frame. Participants seek clarification on the correct approach to creating these diagrams and the subsequent steps in the solution process.

Discussion Character

  • Homework-related
  • Technical explanation
  • Exploratory

Main Points Raised

  • One participant expresses difficulty in drawing the FBD and requests assistance.
  • Another participant suggests starting with two FBDs: one for the pulley at B and another for the rigid frame connecting A-B-C.
  • A participant indicates they have attempted to create the FBDs but is uncertain about their correctness.
  • There is a reminder that a correct FBD must include all forces acting on the body, highlighting a common error of omitting forces.
  • Further clarification is sought regarding the specific struggles faced by the participant, including whether they have experience with similar problems.
  • Another participant emphasizes the need for three FBDs: one for the pulley and one for each link, indicating that help cannot be provided until these are completed.

Areas of Agreement / Disagreement

Participants generally agree on the necessity of creating multiple FBDs for the problem, but there is no consensus on the correctness of the diagrams created by the original poster, as they express uncertainty about their work.

Contextual Notes

Participants have not provided specific assumptions or definitions that might affect the interpretation of the FBDs. The discussion lacks resolved mathematical steps and remains focused on the drawing of diagrams.

jay_chay22
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Homework Statement
Frame and Machine ( engineering mechanics statics )
Relevant Equations
Free body diagram
pic ss.png

pic s.png


I have problem on this question on how to draw free body diagram. Can you please show me on how to draw free body diagram on this question ?
The calculation part I think I do not have a problem with it.

Thank you in advance ! I am really struggle with this question.
 
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I'd start with two FBDs. One for the pulley at B, and the other for the rigid frame that connects A-B-C.

Can you take a first cut at those two FBDs and then say what the next steps in the solution procedure would be?
 
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berkeman said:
I'd start with two FBDs. One for the pulley at B, and the other for the rigid frame that connects A-B-C.

Can you take a first cut at those two FBDs and then say what the next steps in the solution procedure would be?
I already did but I don't know that I am right or not
 
jay_chay22 said:
I already did but I don't know that I am right or not
Use the "Attach files" link below the Edit window to upload PDF or JPEG images of your FBDs. If they are photographs of your work, please be sure they are clear and readable and rightside-up (no sideways images please). Thank you.
 
Remember that a CORRECT FBD includes ALL of the forces on the body. Omitting one or more forces is a very common error.
 
jay_chay22 said:
I have problem on this question on how to draw free body diagram.
... I am really struggle with this question.
Welcome, jay_chay22! :cool:
Why are you struggling with this specific question?
Have you done other problems involving free body diagrams?
 
We still need to see 3 FBDs, one for the pulley and one for each link. Until that is done, there can be little help.
 

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