Static Equilibrium: Understanding Changes in Tension and Vertical Force

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Homework Help Overview

The discussion revolves around a problem involving static equilibrium, specifically focusing on how changes in the position of a load on a uniform beam affect tension and vertical forces at a hinge. Participants are also exploring a related question about forces acting on a ladder.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are attempting to understand the relationship between the position of the load and the resulting changes in tension and vertical force. There is confusion regarding the implications of moving the load and how it affects angles and distances in the equations used. Questions are raised about the notation and the nature of the equations being discussed, particularly whether they pertain to forces or moments.

Discussion Status

The discussion is ongoing, with participants seeking clarification on the notation and the physical principles involved. Some guidance has been offered regarding the need to consider moments, but there is no explicit consensus on the interpretations or solutions to the problems presented.

Contextual Notes

Participants are grappling with the implications of moving loads and the corresponding changes in forces, with some expressing uncertainty about the definitions and relationships in their equations. There is a mention of potential confusion regarding the use of the same symbols for different distances and angles.

jakeginobi

Homework Statement



If the load on the uniform beam shown below is moved to the left, how do the tension force T and the magnitude of the vertical force Fv exerted by the wall on the hinge change?

The answer is A

Homework Equations


torque = Fdsin(theta)

The Attempt at a Solution


My equation was Tsinx = fd. I understand when the object is moved to the left the distance decreases, and the angle decreases, but I don't understand how the vertical force increases exerted by the wallAlso for the 2nd question ( the ladder one) why is the answer B? What I thought was Fgdcos theta = FN2(d)(cos theta) + FN1(d)(cos theta), so when the distance for FN1 increases wouldn't the force increase too?
 

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jakeginobi said:
and the angle decreases,
What angle decreases? As I read the question, only the load is moving. The cable stays put.
 
jakeginobi said:
What I thought was Fgdcos theta = FN2(d)(cos theta) + FN1(d)(cos theta),
I cannot understand your notation. Is this a force equation or a moment equation? What is Fgd? Is FN2(d) the force FN2 as a function of d, the distance up the ladder, or is it a force multiplied by a distance?
(You will need to consider moments to answer the question.)
 
haruspex said:
I cannot understand your notation. Is this a force equation or a moment equation? What is Fgd? Is FN2(d) the force FN2 as a function of d, the distance up the ladder, or is it a force multiplied by a distance?
(You will need to consider moments to answer the question.)
Oh I meant Fg(d) and it's for the torque equation
 
jakeginobi said:
Oh I meant Fg(d) and it's for the torque equation
Ok. What point are you taking moments about?
You seem to be using the same d for different distances and the same θ for different angles.
 

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