Mechanics > Rotational Dynamics > Angular Momentum

DCS# 1Q50.71

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GYROSCOPE BALANCED ON TWO POINTS

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APPARATUS

gyroscope balanced on two points	202-15-C
rubber mat	202-15-E1
motor	202-15-E6

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DESCRIPTION

Orient the spinning gyroscope with its axis of rotation vertical and the extra mass on top, and it will balance on the two points for several seconds, righting itself when it starts to tip.  

Initially the angular momentum vector is vertical.  The gyroscope is free to rotate about a horizontal axis perpendicular to the base.  As the gyro tips, L precesses to become aligned with the torque.  Then the weight on top produces an additional torque parallel to the original precession vector.  L tries to align with this new torque vector.  The new precession opposes the original tipping motion and rights the gyroscope.

Keep the gyro over the rubber mat, and catch it before it falls.

This is similar to a model gyroscope monorail car.

REFERENCE

Freier and Anderson, Mu-16.