Solving Pulley and Platform Homework w/ Acceleration

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    Platform Pulley
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Homework Help Overview

The discussion revolves around a physics problem involving two construction workers using pulleys to raise themselves on a platform. The problem includes variables such as the mass of the workers, the mass of the platform, and the forces they exert while pulling on the ropes. Participants are exploring the dynamics of the system, including the forces acting on both the workers and the platform.

Discussion Character

  • Mixed

Approaches and Questions Raised

  • Participants discuss various methods of analyzing the forces acting on the workers and the platform, including treating them as a single system. There are attempts to clarify the roles of normal forces, tension, and the forces applied by the workers. Questions arise regarding the differences between the forces exerted by the workers and the tension in the ropes.

Discussion Status

The discussion is active, with participants providing insights and questioning each other's reasoning. Some participants express confusion about the forces involved, while others attempt to clarify the relationships between the forces and the resulting acceleration. There are ongoing explorations of the equations governing the system, with no clear consensus yet reached.

Contextual Notes

Participants are navigating assumptions about the system, such as the mass of the platform and the nature of the forces applied by the workers. There is mention of potential confusion regarding the normal force and the application of forces in the context of the problem.

  • #31
lollikey said:
I got it ! the answer is (4f-7mg) / 7m
Good show.
 
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  • #32
Well, I can't understand why there are 4f and not 2f. I thought it was mechanical advantage but these pulleys are fixed to the ceiling, aren't they? I am obviously missing something.
 
  • #33
Poetria said:
Well, I can't understand why there are 4f and not 2f. I thought it was mechanical advantage but these pulleys are fixed to the ceiling, aren't they? I am obviously missing something.
Draw a line across just below the pulleys. How many ropes cross that line? What is the tension in each?
 
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  • #34
I see. There are four ropes and each of them has tension f.
 
  • #35
Poetria said:
I see. There are four ropes and each of them has tension f.
Right.
 
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  • #36
I got it. Many thanks. :)
 

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