One case can contain multiple units
One box contains only one unit
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A case typically refers to a container for storing or carrying items, while a box specifically refers to a square or rectangular container with sides and a lid. Boxes are a type of case, but not all cases are boxes.
The net force on the box is the difference between the applied force and the force of friction. In this case, the net force on the box is 13 N (20 N - 7 N) in the direction of the applied force.
The net force is the difference between the two forces. In this case, the net force is 20N (left force) - 10N (right force) = 10N to the left.
The net force applied is equal to the difference between the upward force and the weight of the box. In this case, it would be 39 N - 35 N = 4 N. Therefore, a net force of 4 N is applied to pick up the box.
The main difference between static and dynamic pass box is the airflow. In a static pass box, the airflow is restricted to prevent contaminants from entering the clean room. In a dynamic pass box, there is continuous airflow to help remove contaminants as items are transferred.
There would be more friction between the heavy wooden box and the floor than the light wooden box. This is because the friction force is directly proportional to the weight of the object pressing down on the surface, which in this case is the weight of the box. The heavier box would exert more pressure on the floor, resulting in greater friction.