Thread Spool Resting on Table: Understanding Lever Arm and Torque

[kris_h41]

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

 

[cesiumfrog]

Is such a thing physically possible?

 

[MrXow]

I think that the angle would be 45 degrees because in this problem, with a frictionless table, sinx = cosx

 

[MagikRevolver]

Is the table frictionless?