i have an sticky platform in space and i drive over it a car
i start making a circle over the platform of 20 m and i reduce radius to 10 m, engine off
both platform and car will spin around a common axe and i will have halfed initial radius
obviously nothing speeds up
but then how is angular momentum conserved in this case?
if im not explained how angular momentum is conserved in this case i hope you respect my right to say conservation of angular momentum doesnt acomplish in certain cases
not only that, if angular momentum is not conserved in this case in my view all physics are under suspicious being all based on this premise