Cylinder+String Rolling w/o slipping

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SUMMARY

The discussion centers on a physics problem involving a uniform cylinder of mass M and radius R, which falls vertically while a string wrapped around it remains fixed. The acceleration of the cylinder is conclusively determined to be a downward magnitude of a = 2g/3. Additionally, the tension in the string is to be calculated using Newton's second law and the moment of inertia formula I = 1/2MR², along with torque equations.

PREREQUISITES
  • Understanding of Newton's second law of motion
  • Familiarity with torque and rotational dynamics
  • Knowledge of moment of inertia, specifically I = 1/2MR²
  • Ability to draw and interpret free-body diagrams
NEXT STEPS
  • Study the application of Newton's second law in rotational motion
  • Learn about the relationship between linear acceleration and angular acceleration
  • Explore the concept of torque and its calculation in various scenarios
  • Investigate the conservation of mechanical energy in falling objects
USEFUL FOR

This discussion is beneficial for physics students, educators, and anyone interested in understanding the dynamics of rotating bodies and the application of Newtonian mechanics in real-world scenarios.

Imuell1
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Homework Statement


A uniform cylinder of mass M and radius R has a string wrapped around it. The string is held fixed, and the cylinder falls vertically. (a) Show that the acceleration of the cylinder is downward with a magnitude a=2g/3. (b) Find the tension in the string.



Homework Equations


I=1/2MR2


The Attempt at a Solution


Not sure how to start, does it involve the conservation of mechanical energy?
 
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Try Newton's methods.

Draw a freebody diagram for the cylinder, include all the forces acting on it and use Newton's second law, along with torque = Ialpha, to solve for your unknowns
 

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