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There are at least two very different meanings of "force field". One is the science fictional concept of some energy barrier that basically acts like an invisible wall, and that's the one that comes to mind for most people. The Earth doesn't have one of those.

However, it's also possible to use the term to mean simply the sum of forces in a region of space, and in that sense the Earth does have one: its magnetic and gravitational fields. (It's usually safe to ignore the color and weak forces, because their range is so very short.)

One additional definition is in molecular modelling, where a "force field" is basically a set of parameters used to build the mathematical model of a molecule. There are lots of these. Off the top of my head, there's AMBER, GROMOS, "Universal", TOPPAR, Momany and Rone, SYBYL, and I'm sure there are many others I've never personally worked with.

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12y ago

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