Efficiently Solving a Simple Pulley Question with Mass and Force Calculations

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Homework Help Overview

The discussion revolves around a physics problem involving a window washer using a bucket-pulley system to raise herself. The problem specifically addresses the force required to pull herself upward at a constant speed, given the mass of the person and bucket combined.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • Participants discuss the calculation of force using the equation f=ma, with one participant questioning the correctness of their result. Another participant emphasizes the importance of understanding the tension in the rope and the arrangement of the pulley system.

Discussion Status

The discussion is ongoing, with participants exploring the setup of the pulley system and the forces involved. Guidance has been offered regarding the consideration of tension in the rope, but no consensus or resolution has been reached yet.

Contextual Notes

Participants note the lack of detail regarding the specific pulley arrangement, which may affect the analysis of forces and tension. There is an emphasis on understanding the system dynamics without acceleration.

I_LuV_FiZiX
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Homework Statement


A window washer pulls herself upward using the bucket-pulley apparatus shown in figure below.


Homework Equations


With what force must she pull downward to raise herself slowly at constant speed? The mass of person plus bucket is 66.3 kg.


The Attempt at a Solution


f=ma
f=66.3 x 9.8
f=650N
wrong?
 
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I_LuV_FiZiX said:

Homework Statement


A window washer pulls herself upward using the bucket-pulley apparatus shown in figure below.


Homework Equations


With what force must she pull downward to raise herself slowly at constant speed? The mass of person plus bucket is 66.3 kg.


The Attempt at a Solution


f=ma
f=66.3 x 9.8
f=650N
wrong?

Hi I_LuV_FiZiX! :smile:

(You haven't told us what the pulley arrangement is. :rolleyes:)

Hint: in these questions, always ask yourself what the tension in the rope is. :wink:
 
the pulley arrangement is two strings parallel to each other with a pulley at the top, she is in the bucket attached to the string on the left, and she is pulling down on the pulley on the right in order to bring her and the bucket up...thanks for considering my question :smile:
 
I_LuV_FiZiX said:
the pulley arrangement is two strings parallel to each other with a pulley at the top, she is in the bucket attached to the string on the left, and she is pulling down on the pulley on the right in order to bring her and the bucket up

ok … then consider the forces on the bucket … what is the tension in the rope if there is no acceleration? :smile:
 

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