Force and torque TBR

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redbird1133

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  1. Pre-Medical
Mass of rod= 0.5kg
Counterweight mass=0.01kg
When the pan is empty, the rod is balanced at x=1cm.
Based on the picture in figure 1 (attached), when calculating the mass of the pan, the fulcrum exerts:
The answer is: a force on the rod but no torque.
I'm confused why there is no torque because doesn't the rod rotate around the fulcrum causing torque around this pivot point?
Thanks!
 

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I am slightly confused as to what you are asking; but I think you are asking why the fulcrum does not exert a torque on the rod?

Torque = r x F

r is the distance from the pivot point to the force, in the case of the fulcrum that is zero.

A force acting at the axis of rotation exerts zero torque - though it does exert an upwards normal force.
 
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