| | The STANDARD force, and/or weight
Jeremy Watts wrote:
There are some things that we might say that will commit us: For
example if we say that a body's mass is the ratio of its weight (w),
divided by the acceleration (g) at which it will free fall; which is
equal to the ratio of the net force (f) exerted on and/or by it,
divided by the acceleration (a) that is caused: Then - for better or
worse - we are committed to this statement; so that in all future use
of "mass" we must include the entire contents of the statement.
We cannot say f=ma, or w=mg, because m=w/g=f/a: We must use w/g or f/a;
not m; as f=fa/a, or f=wg/a, or w=wg/a. That's my two cents worth.