Understanding Why No Torque is Produced at O

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SUMMARY

The discussion centers on the concept of torque and its calculation about a specific point, labeled as O. Participants clarify that the forces, specifically the gravitational force (mg) and the normal force (N), do not produce torque about point O due to their line of action passing through that point. The key takeaway is that torque is calculated as the cross product of the position vector and the force vector, and if the position vector is zero, the torque is also zero.

PREREQUISITES
  • Understanding of basic physics concepts, particularly forces and torque.
  • Familiarity with vector mathematics, including cross products.
  • Knowledge of how to identify the line of action of forces.
  • Ability to analyze static equilibrium in mechanical systems.
NEXT STEPS
  • Study the principles of torque calculation in detail, focusing on the cross product of vectors.
  • Learn about static equilibrium and its conditions in mechanical systems.
  • Explore examples of torque in various physical scenarios, including beams and levers.
  • Investigate the role of pivot points in torque generation and force application.
USEFUL FOR

Students of physics, mechanical engineers, and anyone studying statics or dynamics in engineering contexts will benefit from this discussion.

princejan7
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Homework Statement


http://postimg.org/image/tdocieaxx/

Why does the force system produce no torque about O
don't mg and N produce a torque about O?

Homework Equations





The Attempt at a Solution


 
Last edited by a moderator:
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princejan7 said:

Homework Statement


http://postimg.org/image/tdocieaxx/

Why does the force system produce no torque about O
don't mg and N produce a torque about O?

Homework Equations



The Attempt at a Solution


attachment.php?attachmentid=68166&stc=1&d=1396239764.png


How is torque about a point calculated?
 

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