Monday, January 13, 2014
Rotational Inertia resource
This video shows a spin from an ice skater that, when she tucks in her arms and legs, reaches up to over 300 rpm. I thought this was a very good video to show off rotational inertia, as it is very clear that she is able to reach those speeds only after tucking in her arms and legs.
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I agree that it is very clear that when she tucks in her arms and legs she goes much faster, but next time I think you should write more in-depth about why. It would have been good to mention that the distribution of mass affects the rotational inertia of the ice-skater. The further away the mass is from the axis of rotation, the more rotational inertia there is. The decrease of rotational inertia increases the rotational velocity, meaning that the ice-skater goes faster.
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