The normal force has done no work on the box (Wn).
The term "force" has a precise definition in science. At this level, it makes perfect sense to refer to a force as either a push or a pull. An object does not contain a force or "have it in it. "Another object exerts a force on the first. The concept of a force applies to both living and inanimate objects.
There are primarily two categories that can be used to classify forces: Contact Powers. Forces without contact.
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