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G-force (gravitational force) is the force pulling
an object toward the center of the earth. Normally,
we are suffering a 1G when we are stationary.
When a car is cornering or accelerating, the driver
suffers more than 1G; a 10-pound human head will
weigh 30 pounds under 3G acceleration.
1G = 9.8 m/sec2, 1Gs = 9.8 m/sec
A golf swing is about 5000 Gs; therefore, do
not wear an mechanical watch when playing golf.
According to the ISO 1413 standard, the shock
resistance test is conducted by using a pendulum
impact testing machine. The mechanism sets off
a circular movement which brings the pendulum
to hit the watch. When the watch is hit by the
pendulum, the watch will "fly" at the
presetted acceleration, e.g. 5000 Gs.
1st shock is directed
against the side of the case, parallel to the
plane of the watch, on the 9 o'clock side.
2nd shock is directed
against the glass, perpendicular to the plane
of the watch.
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Pendulum Impact Testing Machine
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