Rolling cylinder on cylindrical plane

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SUMMARY

The discussion focuses on the dynamics of a rolling cylinder on a cylindrical plane, specifically addressing the relationship between the angular velocities of the cylinder and the rod. Key equations include the translational kinetic energy (K.E) expressed as K.E (translational) = 0.5*m*v^2 and the rotational kinetic energy as K.E (rotational) = 0.5*I*omega^2. The moment of inertia (I) for the cylinder is determined using I (com) = 0.5*m*r^2, and the parallel axis theorem is emphasized for calculating the moment of inertia about point O. The consensus confirms that the angular velocity of the center of mass (CM) of the cylinder is equal to that of the rod about point O.

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maffra
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Homework Statement



See attached

Homework Equations


K.E (rotational) = .5*I*omega^2
K.E (translational) = .5*m*v^2

The Attempt at a Solution



v(of rod and translational vel of cylinder) = L * (dαlpha/dt)

Is the angular velocity of the cylinder the same as the angular velocity of the rod?
To calculate the translational K.E of the cylinder can I use the vel I've calculated above for the rod?
For the rotational vel of the cylinder, can i use I (com) = 0.5*m*r^2
 

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maffra said:
Is the angular velocity of the cylinder the same as the angular velocity of the rod?

The angular velocity of the CM of the cylinder about O will be equal to the angular velocity of the rod about O. But the cylinder has a different angular velocity wrt its CM.

To calculate the translational K.E of the cylinder can I use the vel I've calculated above for the rod?

Yes.

For the rotational vel of the cylinder, can i use I (com) = 0.5*m*r^2

Yes. But to find the MI about O, you have use parallel axis theorem.
 

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