According to image a motor rotate two ring type flywheels(their mass concentrated away from center) one in clockwise other in anti-clockwise at high speed. If we try to change their rotation axis in same plane, would they try to oppose this change. In brief I want to ask- Is magnitude of force required to make this change is same or different when motor is on state(flywheels are running) and off state(flywheels are not running) ?
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1$\begingroup$ physics.stackexchange.com/questions/79699/… and physics.stackexchange.com/questions/17398/… $\endgroup$ – BowlOfRed Sep 8 '16 at 8:48
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$\begingroup$ After reading these two link : both flywheels still need more force due to angular inertia of the system compare to stationary state. Is it right? $\endgroup$ – Sushil Sep 8 '16 at 10:10
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$\begingroup$ Nope. youtu.be/vGun5athdfg shows a double gyroscope acting as if it is not spinning at all. $\endgroup$ – BowlOfRed Sep 8 '16 at 15:52
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The total angular momentum is zero, so no external torque is needed to get the axis to change. But there would need to be internal torques on both flywheels, it's just that each could provide the torque on the other. An external influence could then easily change the axis of the whole system.
