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F= -mg.

Galileo said that Force is proportional to mass but in the opposite direction. I don't want to discuss whether he was right or wrong.

I just want to ask that when he replaced the proportionality sign and used a 'constant' 'g', why did he use the multiplication sign (this is the standard practice till today).

In other words, whenever there is an interaction

**why**only multiplication sign is used and not the plus (+)sign.

Plus sign can also mean some kind of 'interaction'.

Doesn't F= - (m+g) show some kind of interaction. I mean doesn't the + sign show interaction between two entities in nature.

**( BTW, I know this formula is wrong)**

Forgive me, if it seems too childish a question to ask.