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Restrictions on the frame of reference
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[QUOTE="haruspex, post: 6508060, member: 334404"] The author is taking moments about the CM (big black dot), but that does not imply the author is taking the 3D person as the reference frame. You can choose a static frame with origin at the person's CM at some instant; or you could choose a non inertial frame which is anchored to the CM, so orbits the centre of curvature of the track, but does not rotate relative to the ground frame. Whichever, any fictitious forces act at the CM, so do not affect the torque about there. In all cases, the torque from the difference in the two normal forces balances the torque from the frictional forces. [/QUOTE]
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Restrictions on the frame of reference
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