Balanced And Unbalanced

                                             Balanced And Unbalanced




                             
Box B and D all have unbalanced forces.
Box A and C have balanced forces.

Box A is going 25 N going in a normal force (North), 25 N going in a gravitational force (South), 20 N going in a Friction force (West) and
20 N going in an applied force (East)
Box B is going 25 N in a normal force (North), 20 N going in an applied force (East), 25 N going in a gravitational force (South), and 15 N going in a Friction Force (West).
Box C is going 25 N in a normal force (North), and going 25 N in a gravitational force (South).
Box D is going 25 N in a normal force (North), 20 N going in an applied force (East), and 25 N going in a gravitational force (South).

In order to make box B balanced you need to add 5 N more to the friction force so it can be balanced.
In order to make box D balanced you need to also add 20 N to the friction force so it can be balanced.