In mechanics, a shock is a sudden acceleration or deceleration caused, for example, by impact or explosion. Shock is measured in the same units as acceleration, i.e. metre per second squared. (Note: Shock wave is sometimes abbreviated as shock when the context is clear.)
Sometimes, for convenience, the magnitude of a shock is stated as a multiple of the standard acceleration due to free fall in the Earth's gravity, a quantity with the symbol g having the value 9.80665 m·s-2. Thus a shock of "2g" is equivalent to about 19.6 m/s2.
The italic symbol g used above must not be confused with the upright symbol g meaning gram.
A variety of shock absorbers are used to reduce the strength of shocks in machinery.
Occasionally, a shock produces a visible leak of fluid, but some hint of weep is normal, and most shocks we've seen that were well worn out, also looked bone dry.
Both shock mountings on most late-model vehicles are in the underbody, so if you support the chassis on safety stands, you have access to the top and bottom.
Only a handful of electronic systems' shocks are not available from third parties, either because they're an oddball size or because the tie-in to the vehicle electronics would result in a ride/ handling glitch if you installed nonelectronic replacements.
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