What is the significance of torque in the context of moment of force?

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The discussion focuses on the significance of torque in relation to the moment of force acting on a plank in equilibrium. Participants analyze the forces involved, including the normal reaction force and friction, emphasizing the need for these forces to balance for the plank to remain stationary. It is clarified that the tension force does not contribute to torque about a specific pivot point, as its line of action passes through the pivot. The conversation concludes with the understanding that both the sum of forces and the sum of torques must equal zero for equilibrium. This highlights the critical role of torque in maintaining balance in physical systems.
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TSny said:
(2) The sum of all of the torques acting on the plank must be zero for any choice of the location of the origin for calculating the torques.
If the sum of the forces is zero and if the sum of the torques about a chosen origin is zero then the sum of the torques about any other choice of origin will also be zero.
 
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