The osi is a reference system that is used by most types of technicians except

The army doesn't use it, so that might be the answer, if it isn't sorry but I don't what else it would be.

it does automatically do that fr , and idk what to do bout it , it must be automoderators

only #2 represents an object at rest on a table.

in #1, there is no normal force due to the table; the object is accelerating downward.

in #3, the vertical forces are not balanced; the object is accelerating downward.

in #4, neither the vertical nor the horizontal forces are balanced. the object is accelerating upwards and to the right.