Answer :
"Net force" simply means the sum of all forces. The "unless acted upon by a net force" version is more correct. For example, as you stand or sit still, the earth pushes you up with a force equal and opposite to the force with which gravity pulls you down. The net force, or total force, is zero, so you do not move.
Force and Net Force
Force
- Force is defined as the act of pushing or pulling of an object. It can influence and alter the motion of an object.
Net Force
- Unlike Force which only defines a push or pull, Net Force is the combination of all forces acting on an object. The Net Force can be computed through Newton's Second Law, F=ma.
If I accidentally cited false information, I am open to corrections :).
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