No Response to Physics Homework Help: X-Components of Reaction

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SUMMARY

The discussion focuses on determining the x-components of reaction forces in a physics problem involving a truss structure. The left end at point A is supported by rollers, allowing no horizontal reaction force, while the right end provides the necessary horizontal support. Understanding the mechanics of roller joints simplifies the problem significantly, as they are commonly used in real-world structures like bridges. The key takeaway is the importance of recognizing support types in analyzing reaction forces.

PREREQUISITES
  • Understanding of static equilibrium in physics
  • Familiarity with reaction forces and support types
  • Knowledge of truss structures and their components
  • Ability to interpret diagrams and schematics in physics problems
NEXT STEPS
  • Study the principles of static equilibrium in physics
  • Learn about different types of supports and their effects on structures
  • Explore the analysis of truss structures using methods such as the method of joints
  • Review real-world applications of roller supports in engineering design
USEFUL FOR

This discussion is beneficial for physics students, engineering students, and educators seeking to deepen their understanding of reaction forces in structural analysis.

jehan60188
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tried posting in homework help, but haven't received a response
would appreciate any input!

original topic: https://www.physicsforums.com/showthread.php?t=584077

the problem: http://desmond.imageshack.us/Himg839/scaled.php?server=839&filename=truss1.png&res=medium

i can't figure out how to get the x-components of the reaction
thanks!
 
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This requires that you know how to read the universal code used by professors and textbook authors. This is secret, so do not tell anyone what I am about to divulge to you here.

The left hand end at A is supported on rollers, but the right end is supported on a solid support to ground. This means that there can be no horizontal reaction force at A but there can be at the right end. There for the entire reaction to all applied horizontal forces is taken out at the right end.

In actual fact, this is not as mysterious as it looks. Actual strictures, such as bridges, etc. are built with only one fixed point, and the other horizontal supports are on rollers.
 
Ah, didn't notice the roller joint, makes this problem a lot easier, thanks!
 

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