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Well in a real system everything has “forces” acting upon them but in definition mass is only weight when gravitational acceleration is factored in
In metric system they pretend Kg is the same as Newtons when it isn’t whereas as I showed earlier pounds mass (lbm) and pounds force(lbf) have a 1/1 relationship because of the standard acc due to gravity
So for us common folk weight is much better and more accurate with imperial units
americans care about weight now