[Phys-L] Re: A Third law question

[cparker at CHARTER.NET (cliff)]

In experiments, it is found that the force
>  in question is proportional to the object's mass, and to the
>  object's acceleration if "deep space"-like conditions are set up.
> Near Earth, the force on the stationary mass is proportional
>  simply to its mass.

Ahh yes and what is this thing you speak of called mass?