What is the similarities between balanced and unbalanced forces?

Unlike balanced forces, unbalanced forces always cause a change in motion. They are not equal and opposite. When two unbalanced forces are exerted in opposite directions, their combined force is equal to the difference between the two forces and is exerted in the direction of the larger force.

The correct answer to this question is letter "C.Psychological constructs cannot be researched in psychology because they are unobservable." The statement about psychological constructs is true is that psychological constructs cannot be researched in psychology because they are unobservable.