Equilibrium and tension in elastic strings

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SUMMARY

The discussion centers on understanding equilibrium and tension in elastic strings, specifically in the context of a homework problem. Key points include the confusion regarding the application of tension as a moment force, the choice of pivot points for calculating moments, and the discrepancies in the marking scheme regarding distances used in calculations. The participant expresses difficulty in grasping these concepts, indicating a need for clarity on the principles of tension and equilibrium in elastic systems.

PREREQUISITES
  • Understanding of basic mechanics principles, particularly equilibrium.
  • Familiarity with tension forces in elastic materials.
  • Knowledge of moment calculations and pivot points.
  • Experience with problem-solving in physics, especially involving strings and forces.
NEXT STEPS
  • Study the principles of tension in elastic strings and their applications.
  • Learn about calculating moments and choosing appropriate pivot points in physics problems.
  • Review examples of equilibrium problems involving multiple forces and tensions.
  • Explore the differences in marking schemes and how they affect problem-solving approaches.
USEFUL FOR

This discussion is beneficial for physics students, educators, and anyone seeking to deepen their understanding of equilibrium and tension in elastic systems.

abdo799
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Homework Statement


problem attached

Homework Equations





The Attempt at a Solution


well, there is pretty much nothing i can write here, i couldn't solve it because this is the first time i face a problem like that , i have some problems understanding it though
1-if we considered the tension a force that make a moment , (eg tension in PC ) where will be that force so i can take a distance will it be at P or C ?
2- in other problems of equilibrium , when i take the distance , i take the distance to pivot ( in this one A ) but in this one , in the marking scheme , he took the distance to AB , and not the point A , why?
3- he took the force of tension in the horizontal string to have a moment and when he mentioned the distance , it was the distance to the point A and not the vertical AB why?
 

Attachments

  • 2014-04-02 22_15_09-papers.xtremepapers.com_CIE_Cambridge International A and AS Level_Mathemati.png
    2014-04-02 22_15_09-papers.xtremepapers.com_CIE_Cambridge International A and AS Level_Mathemati.png
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Never mind.. a friend saw the question and answered me
Thanks
 

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