Thread Spool Resting on Table: Understanding Lever Arm and Torque

  • Thread starter kris_h41
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In summary, the conversation discussed a scenario where a common thread spool was placed on a flat table and a person gently pulled on a short piece of thread attached to the spool, causing it to slide without rotating. It was concluded that with the thread arm at this angle, the lever arm is small, but not zero, and the torque is zero. The conversation then questioned the physical possibility of this scenario and considered the angle to be 45 degrees due to the relationship between sin and cos. The table's friction was also brought into consideration.
  • #1
kris_h41
2
0
a common thread spool rests on a flat table. you gentyly pull at an angle on a short piece of thread attached to the spool that causes the spool to slide withouut rotating. with the thread arm at this ange the lever arm is??

a- small, but not zero, and the torque is zero
b- perpendicular to the applied force
c-small and the torque is also small
d-zero and their is no torque produced by your pull
 
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  • #2
Is such a thing physically possible?
 
  • #3
I think that the angle would be 45 degrees because in this problem, with a frictionless table, sinx = cosx
 
  • #4
Is the table frictionless?
 

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