Static Equilibrium: Understanding Changes in Tension and Vertical Force

In summary, the tension force T and the magnitude of the vertical force Fv exerted by the wall on the hinge change when the load on the uniform beam is moved to the left. The distance and angle decrease, causing an increase in the vertical force exerted by the wall. For the second question regarding a ladder, the answer is B because the distance and angle decrease, which affects the torque equation and the force exerted by the wall. The notation used in the conversation may be confusing, but considering moments is necessary to properly answer the question.
  • #1
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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  • #2
jakeginobi said:
and the angle decreases,
What angle decreases? As I read the question, only the load is moving. The cable stays put.
 
  • #3
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.)
 
  • #4
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
 
  • #5
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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