Bending motion and shear force

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Discussion Overview

The discussion revolves around the analysis of a cantilever beam subjected to a point load, specifically focusing on calculating the reactions at supports and understanding bending motion and shear force. The conversation includes attempts to derive equations and clarify concepts related to static equilibrium.

Discussion Character

  • Technical explanation, Debate/contested, Homework-related

Main Points Raised

  • One participant presents an initial approach to calculate the reactions Ra and Rb using the equation Ra x 2 = 5 x X.
  • Another participant expresses confusion regarding the diagram and requests a visual representation to better understand the problem.
  • Multiple participants challenge the correctness of the initial equations provided, suggesting that they may not be valid.
  • A later reply emphasizes the need for a free body diagram and static balance equations, stating that Ra may not be applicable in this scenario.

Areas of Agreement / Disagreement

Participants do not appear to agree on the validity of the initial equations or the necessity of Ra in the analysis. There are competing views on how to approach the problem, and the discussion remains unresolved.

Contextual Notes

Limitations include a lack of clarity in the diagram, potential misinterpretation of the problem setup, and unresolved steps in deriving the equations for static equilibrium.

lee123456789
Messages
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Reaction score
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Homework Statement
none
Relevant Equations
none
A cantilever beam 2 meter in length, 5KN act at point (A) of the beam. There is point x it looks like half way along the beam. how do i workout the distance of point X so work out the magnidues of Ra and Rb so i can go onto working out bending motion and shear force?ruff idea i had
1) Ra x 2 = 5 x X = 5X
2) Ra = 5X/12 = 0.416XkN
 
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I can’t understand the diagram only by the description.
Could you show some drawing, please?
 
Lnewqban said:
I can’t understand the diagram only by the description.
Could you show some drawing, please?
Screenshot 2020-10-28 180157.png
 
  • Like
Likes   Reactions: Lnewqban
There is no Ra in your case.
First, complete a free body diagram and the equations of static balance for the vertical forces and the moments.
 

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