Why Are G-Units Preferred Over Direct Force Measurements?

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Why do people use G-units? Essentially it is a ratio of the acceleration with gravity, why not use force directly? Can anyone enlighten me? Thanks.
 

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And you can't use force because its not constant for each body, only the acceleration is. For example I experience a greater force from gravity than my computer, which I am about to drop out the window, does because I have more mass.

I always though it would be cool if they used a z instead of a g because then everyone would sound like they had a german accent.