- #1
shortydeb
- 29
- 1
..and he brings in his arms to decrease his moment of inertia in order to increase his angular velocity, that means the rotational kinetic energy increases. But that means there's a change in rotational kinetic energy, right? But wouldn't there be no external forces acting on him (assuming no air resistance or friction from the ice), so how come energy isn't conserved? Since the gravitational potential energy doesn't change, and there is no change in translational kinetic energy (though i am really not sure on these two). It looks like the final total mechanical energy is different from the initial total mechanical energy.
Any help at all would be terrific...
Any help at all would be terrific...