Calculating Net Torque for Disk in Diagram D

AI Thread Summary
To calculate the net torque about the pivot in Diagram D, it's crucial to consider both the magnitude and direction of the forces applied to the disk. While the initial thought was to simply multiply the force by the radius, this approach overlooks the vector nature of torque, which requires specifying whether the torque is clockwise or counterclockwise. The direction can be determined using the right-hand rule, indicating whether it points into or out of the page. Understanding the distinction between torques generated by different shapes, like disks versus rods, is also important. Properly accounting for these factors will lead to an accurate calculation of net torque.
nahanksh
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Homework Statement


http://online.physics.uiuc.edu/cgi/courses/shell/common/showme.pl?courses/phys211/oldexams/exam3/sp08/fig10.gif

What's the net torques about the pivot, represented by the dot (•), in the diagram D. The solid arrows represent the magnitude and direction of the forces applied to the objects.


Homework Equations





The Attempt at a Solution



I thought it's just F0 multiplied by R but it turns out to be wrong..

Should something be considered if it's disk?
(Because i have seen only the cases of rod getting torques)

What's wrong in my thought?
Please help me out here.
 
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Your magnitude of the torque is correct, but since Torque is a vector, you must also specify its direction. Is it clockwise or counterclockwise, (or, using by convention the right hand rule, pointing into the page or out of the page)?
 
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