The Bizarre Behavior Of A Spinning Flywheel
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MIT astrophysicist Professor Walter Lewin demonstrates the bizarre behavior of a spinning bicycle wheel.

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Professor Lewin demonstrates the bizarre behavior of a spinning flywheel that experiences a torque due to gravity.  By suspending the axle of a fast rotating bicycle wheel from a rope and increasing the torque, the precession frequency increases.  (Precession is a change in the orientation of the rotational axis of a rotating body.)  The direction of precession can be reversed if the direction of rotation of the wheel is reversed.  You can also observe this very non-intuitive behavior with a toy gyroscope.   This video is a part of a lecture from MIT open courseware.
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