Answer:
The answer is:
- left and right forces that can be added together
-upward and downward forces that can be added together
The explanation:
-when the parallel force system is a situation in which two forces of equal magnitude act in the same direction within the same plane,
-and the parallel forces lie in the same plane and have lines of action that never intersect each other. Two forces that are parallel can either be in the same direction or in opposite directions.
and the only 2 phases that satisfy this definition are:
- left and right forces that can be added together
-upward and downward forces that can be added together
Step-by-step explanation: