The torque causes precession
of the wheel around the position where the axis is attached
to the axis.
dL/dt
= τ
Here, the torque
τ
is horizontal and
perpendicular to
the angular momentum
L.
Hence, dL/dt
perpendicular to
the angular momentum
L.
With time the orientation of the angular momentum
L.
changes, which necessarily changes the orientation of the wheel,
as is shown in the above figure.
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