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physics (making a yo-yo)

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I am required to make a yo-yo that will unwind at a slowest rate possible, without using friction as a factor.
Will it help if I make it hollow, so it would have more rotational inertia?
Any other ideas? Please help!!

  • physics (making a yo-yo) -

    the smallest diameter spindle possible and the largest rotational inertia to weight ratio (i.e. a hollow center).

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