Amzakil

Translational Kinetic Energy Excluded

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Hey guys. It's my first time here.

The two problems below are virtually the same. I don't know the reason why the second has translational kinetic energy included while the first doesn't.

 

Rotation2.png

Rotation.png

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In the second problem there is a fixed axis of rotation. That's why there is no translational KE. The cylinder is not free to move linearly (only rotationally)

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