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Firstly, the aspect of spin and inertia.
Can we call it angular momentum, please?I don't want to appear grumpy but I have a bit of crusade against 'inertia' which is not really a defined quantity. If one person means one thing and someone else means another then then cofusion reigns.
But does your 'inertia' refer to something moving, not moving or trying not to move?
Ahh... Me is confused... So how does the thing spin around, without the actual tip of the bottom spinning?
There is a story (could be true) about a gyro in the inertial(!!!) guidance system of a rocket that was built in the UK. The gyro was spun up and tested, then the rocket was shipped to Australia for testing.The gyro kept spinning on its excellent bearings, stayed pointing the same way on its journey and ended up 'upside down' on arrival in Oz.No one spotted the inversion when they turned on the control circuits.On being launched, the rocket aimed for the ground!