When forces are balanced, what affect does that have on the motion of an object?

Balanced forces cause no change in motion, even if the object is moving.

According to Newton’s 1st law, all objects remain stable unless acted upon by an unbalanced force, so this means that since the forces are balanced, the motion would remain at rest. If there was a greater force on one side of the object, then it would be pushed to the other side (ex. Pushing a heavy box from the right, makes it go left). I hope that helps...