Rotational Kinematics (String attached to disk)

AI Thread Summary
The discussion focuses on determining the relationship between the angular acceleration of a flywheel, the downward acceleration of a block, and the radius of the ring in a physics problem. Participants suggest using free-body diagrams (FBD) to analyze the forces acting on both the hanging mass and the spinning mass. The tension in the string is identified as a key factor, as it creates torque on the flywheel, which can be expressed with the equation τ=Iα. Additionally, conservation of energy is mentioned as a potential method for solving the problem, assuming constant acceleration. Understanding these concepts is essential for solving the rotational kinematics problem effectively.
mattj150
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Homework Statement


Determine the relationship between the angular
acceleration of the flywheel, the downward acceleration of the block, and the radius of
the ring.

Known data:
Mass Ring: 1.420 kg
Radius Ring (Inside, then Outside): 5.10 cm, 6.325 cm
Mass Disk: 1.455 kg
Radius Disk: 11.45 cm
Mass Shaft: Negligable
Radius Shaft: 0.6 cm



Homework Equations



ω=ω0 + αt
f=ma

The Attempt at a Solution


I'm really lost on this, i assume that i need to calculate the tension the block places on the string (F=MA)? Could anyone give me a hint on how to get started on this.
 

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Welcome to PF;
Your wish is my command:
hint: draw free-body diagrams.

Though you could use conservation of energy and assume acceleration is constant.
 
I understand how to do the FBD for the hanging mass. The forces acting on it are simply Fg and Ft. How would i do a FBD for the spinning mass? Would i pick a point on the outer edge to do it for?
 
The tension force acts at a particular location on the flywheel - creating a torque. ##\tau=I\alpha##
 

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