Re: Can't figure out the following gyroscope example?

On Jul 11, 6:58 pm, Eric Gisse <jowr...@xxxxxxxxx> wrote:
On Jul 11, 2:11 pm, "g...@xxxxxxxxxxx" <g...@xxxxxxxxxxx> wrote:

http://science.howstuffworks.com/gyroscope2.htm

[...]

The reason you can't figure it out

All the information needed is below here otherwise they(not me)
omitted a detail.

They say the forces cancel out because the wheel spins 180 with a
Newton reaction force that will negate the applied force.

They say it also spins 90 degrees and it's reaction force generates
the final resultant spin...well how come 270 degrees doesn't negate
that force?

And why not 45 degrees as well...instead of 90 (using the explanation
they gave below here)?


http://science.howstuffworks.com/gyroscope2.htm

Quote:"This effect is the cause of precession. The different sections
of the gyroscope receive forces at one point but then rotate to new
positions! When the section at the top of the gyro rotates 90 degrees
to the side, it continues in its desire to move to the left. The same
holds true for the section at the bottom -- it rotates 90 degrees to
the side and it continues in its desire to move to the right. These
forces rotate the wheel in the precession direction. As the
identified
points continue to rotate 90 more degrees, their original motions are
cancelled. So the gyroscope's axle hangs in the air and precesses. "


They say force is applied but the wheel spins 90deg. and now the
force
wants to turn to the left, then another 90 deg. cancels out the
initial applied force....well then how come another 90 deg. = 270 deg
doesn't cancel out the force at 90 degrees????

.