Iphone tossing your phone to flip without Left-Right rotation?
This is a physics question.
Take your phone out from your pocket. Hold it out on your right hand having your thumb on the bottom middle of your phone (front side) and having your Index and middle finger on the middle of the back of your phone.
Try and do a perfect backflip.
Notice how your phone will try and rotate from left-to-right while doing the flip. It's almost impossible to do a perfect backflip.
Why is this?
Your phone (and any object) has three separate axes through it.
It turns out that for an object where these axes have different moments of inertia, then rotation about the axis with the intermediate value between the other two is unstable. For your iphone, the middle length axis goes from one side to the other and is how you are trying to "flip" it.
The reason for this gets into complex mathematics that you may not care to follow. But if an object is spinning around either the smallest or longest primary axis, then the angular momentum vector and the axes for moments of inertia become pinned together. Since the angular momentum is fixed while it's in the air, it spins stably.
But rotation around the intermediate primary axis is not trapped. The angular momentum vector can point anywhere along a set of circles that surround the object. So the angular momentum of the phone is constant, but the orientation of the object is not locked and it can tumble.
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