A Balanced Force is when 2 objects acting on each other cancel each other out, and the net is zero. While an Unbalanced Force is when there is a cause of change in motion, the object while move towards the direction of the net force.
a lot of people may think that the word "Acceleration" means to speed up, yes, that is PART of the actual definition but the meaning of the word is actually to speed up or slow down and to change direction.
A Force is defined as a push or pull and is measured as Newtons, and can be referred to as Contact/Non-Contact forces.
the net force is the amount that is "left over" when all forces are combined, if the two forces are opposite you subtract, but if both forces are in the equivalent direction you add.