Tension or Compression: Determining the Forces on a Hinged Support Point

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SUMMARY

The discussion centers on determining the forces acting on two light rigid rods, P and Q, supporting a weight W in static equilibrium. Participants clarify that compression refers to an inward force on the rod, while tension indicates an outward force. The problem-solving approach involves applying Newton's second law to analyze the forces at the hinge where the rods meet. The key takeaway is that understanding the distinction between tension and compression is crucial for solving static equilibrium problems.

PREREQUISITES
  • Understanding of static equilibrium principles
  • Familiarity with Newton's second law of motion
  • Basic knowledge of forces and their classifications (tension and compression)
  • Ability to analyze free-body diagrams
NEXT STEPS
  • Study static equilibrium problems involving multiple forces
  • Learn how to construct and analyze free-body diagrams
  • Explore examples of tension and compression in structural engineering
  • Review applications of Newton's second law in static systems
USEFUL FOR

Students of physics, engineering students, and anyone interested in mechanics and structural analysis will benefit from this discussion.

tonald
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The figure shows a weight W supported by two light rigid rods P and Q. The rods are smoothly hinged to the wall and mounted in the same vertical plane. Which rod is in compression , is in tension?
 

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Show what you've done so far and where you got stuck.
 
I can't think anything...
Actually, compression means the force towards the wall?
Can you give me some hints to start with the question...
 
"Compression" means that there's an inward force pushing on the ends of the rod; "tension" means there's an outward force on the rod.

This is a problem in static equilibrium.
 
Can you show me how to solve this question...
I really can't solve it
or please give me some hints to guide me to finish it ,thanks...
 
Welcome to PF!

tonald said:
The figure shows a weight W supported by two light rigid rods P and Q. The rods are smoothly hinged to the wall and mounted in the same vertical plane. Which rod is in compression , is in tension?

Hi tonald! Welcome to PF! :smile:

Hint: use good ol' Newton's second law on the peg (or whatever it is) where the two rods meet …

it isn't moving, and there are three forces on it, so they … ? :smile:
 

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