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I just don't get it


Fantabulous

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Why can't I flip my phone or book or any similar object in a way that it rotates around horizontally and not also in a other direction ?

 

You need to find the axis of rotation for the object in order to make it spin in a uniform manner. Finding the axis of rotation for a uniform object is easy, but non uniform objects are much harder, which is what makes it difficult.

 

The fact that it spins in a direction other than horizontal is probably because you are applying a force in a non uniform direction, even though you might think you are, making it spin non horizontally.

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