How Does Net Torque Affect Pulley Acceleration in an Atwood Machine?

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SUMMARY

The discussion focuses on the relationship between net torque and pulley acceleration in an Atwood machine. It establishes that net torque is necessary for rotation, which occurs when tension forces differ, specifically T1 > mAg and T2 < mBg. The participants emphasize the importance of free-body diagrams to visualize the forces acting on the system. The conversation highlights the need for clarity on which mass corresponds to which variable in the equations of motion.

PREREQUISITES
  • Understanding of Newton's Second Law of Motion
  • Familiarity with the concepts of torque and rotational dynamics
  • Ability to create and interpret free-body diagrams
  • Knowledge of the Atwood machine setup and its components
NEXT STEPS
  • Study the derivation of equations for net torque in rotational systems
  • Learn how to apply Newton's laws to analyze Atwood machines
  • Explore the concept of angular acceleration and its relation to net torque
  • Practice drawing and analyzing free-body diagrams for various mechanical systems
USEFUL FOR

Students of physics, educators teaching mechanics, and engineers involved in mechanical design will benefit from this discussion on net torque and its effects on pulley systems.

solarcat
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Homework Statement
There is a massive pulley that can rotate that has two masses (mass 1 on the left is less than mass 2 on the right). The system starts at rest and the masses have potential energy. Will the tension force be greater on the right side or left side?
Relevant Equations
Torque = Force*Distance
Net Torque on Pulley = Moment of Inertia of Pulley * Angular Acceleration of Pulley
A net torque is required to make the pull rotate, so this can only occur if the tension forces differ. I know mass 1 will accelerate upwards and mass 2 will accelerate downwards, so T1>mAg and T2<mBg. But I don't know where to go from there.
 
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I don't know which is A and which is B, but the idea is ok. Make a drawing and make free-body diagrans
 
241651
 
solarcat said:
A net torque is required to make the pull rotate, so this can only occur if the tension forces differ
Right, so what is the net torque? Which way will the pulley accelerate?
(I don't see how mpg is relevant.)
 

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