Perpendicular force pulley system

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Discussion Overview

The discussion centers on the forces exerted by a load on a pulley system, particularly when the motor starts running. Participants explore whether the forces on two pulleys are equal or if one experiences greater force due to the load's position on a vertically moving lifting platform. The conversation touches on concepts of friction and the calculation of perpendicular forces affecting the system.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • Some participants question whether the forces exerted by the load on pulley 1 and pulley 2 are equal when the motor starts running, considering the load's position at the end of the lifting platform.
  • Others suggest that the load's offset position could lead to increased loading on the rails, resulting in friction losses in the bearings.
  • There is a discussion about the tension in the cord remaining constant once the motor starts, raising questions about how this affects the forces on the pulleys.
  • One participant notes that the described arrangement resembles that of some forklifts, drawing parallels between the components involved.

Areas of Agreement / Disagreement

Participants express differing views on whether the forces on the pulleys are equal or different, with no consensus reached on the implications of the load's position or the effects of tension in the cord.

Contextual Notes

Participants do not provide specific details about the location of the rails or the exact mechanics of the pulley system, which may limit the analysis of the forces involved.

Jorcamero
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i would like to know if the forces exerted by the load on pulley 1 and 2 are equal when the motor star running , or if in pulley 1 is exerted more force because the location of the load at the end of the lifting platform. The lifting platform only moves vertically, restricted by rails. What I want to know if the load will exert a perpendicular force that could create friction on the rails and how to calculate that perpendicular force
 
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Jorcamero said:
View attachment 206627 i would like to know if the forces exerted by the load on pulley 1 and 2 are equal when the motor star running , or if in pulley 1 is exerted more force because the location of the load at the end of the lifting platform. The lifting platform only moves vertically, restricted by rails. What I want to know if the load will exert a perpendicular force that could create friction on the rails and how to calculate that perpendicular force
Welcome to the PF.

You don't show the location of the rails, but with the load offset like that, you will likely get pretty bad loading on the rails and get the associated friction losses in the bearings.
 
But if the tension along the cord keeps constant once the motor start running, how can it be that forces exerted on pulley 1and 2 are different.
 
Jorcamero said:
But if the tension along the cord keeps constant once the motor start running, how can it be that forces exerted on pulley 1and 2 are different.
I didn't say that they were different. I said they are higher than they would be if the load were more balanced.
 
Note that the arrangement you describe is very similar to that on some forklifts, if you replace "lifting platform" with "forks", "motor" with "hydraulic cylinder", and "pulley" with "chain sprocket".
 
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