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Nobody said thatdarkdave said:Gravitational forces are NOT electromagnetic.
The definition of those "forces" itself is arbitrary.And it's not arbitrary if you want to see the significance of one type of force vs another at various types of time increments.
There is one electromagnetic interaction. Each particle feels a single, electromagnetic force. You can divide this force into several components, but there are many possible ways to do that. Therefore, if you drop some of those components, this is always arbitrary. It can be reasonable, if those dropped parts are negligible, but it does not have to be.