# Anti-Gravity Wheel?

In this video a man attempts to lift a 19kg (42 lbs) wheel over his head one-handed while it’s spinning at a few thousand RPM. This replicates an earlier experiment by Professor Eric Laithwaite. He claimed the wheel was ‘light as a feather’ and could not be explained by Newton’s Laws.

# Gyroscopic Precession

Gyroscopic precession – the “wobbling” of a spinning top around its axis.

This is caused by the torque due to the object’s weight. The big idea is that the torque vector increases angular momentum in the direction of torque. So if there is no angular momentum initially, it will cause the system to swing in such a direction that it is rotating with new angular momentum in the direction of the torque. However, if there was angular momentum to begin with, the torque will change the direction of that angular momentum by causing precession.

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