What Is the Role of Point D in a Body Diagram and Moment Equilibrium?

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SUMMARY

The discussion centers on the role of point D in a body diagram concerning moment equilibrium. Participants agree that point D acts as a roller, allowing the structure to hinge at point A while accommodating expansion. The consensus is that no force should be assumed at point D, as this simplifies the analysis of the system, which may involve a pulley rather than a bridge. The equilibrium conditions outlined include net forces in both the x and y directions being zero, along with the total moment also equaling zero.

PREREQUISITES
  • Understanding of moment equilibrium principles
  • Familiarity with body diagrams in mechanics
  • Knowledge of forces and their representation in physics
  • Basic grasp of structural analysis concepts
NEXT STEPS
  • Study the concept of moment equilibrium in static systems
  • Learn about body diagrams and their applications in engineering
  • Explore the mechanics of rollers and pulleys in structural design
  • Investigate the implications of assuming no forces at specific points in mechanical systems
USEFUL FOR

Students of physics and engineering, particularly those studying mechanics, structural engineers, and anyone involved in analyzing forces and moments in static systems.

cracktheegg
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Homework Statement



Untitled_zpseabfa304.png


Homework Equations



M=FA

Equlibrium condition=
net Fy=0
net Fx = 0
Total Moment=0


The Attempt at a Solution


I need help with the body diagrem

The D circle thing is what? is that a roller?
 
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Yes, I also think so. The structure hinges at A and in order to compensate for its expansion it can roll over the supporting surface at D. The cable is there to raise it.
 
photo1_zps28ed9b30.jpg


Did i draw correctly?
 
It seems so,yes. I am also not sure if there should be a force at D since it seems you would not be able to solve it if there is a force present at that point.
 
I think you should assume there is no force at D. Maybe it is not a bridge and it is a pulley at end D.
 
Basic_Physics said:
I think you should assume there is no force at D. Maybe it is not a bridge and it is a pulley at end D.
That is how I see it also. No support at D.
 

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