Question

unit test forces and motion which criteria is necessary for a force to exist? differing masses between objects two objects interacting one very large object two objects far apart from each other

Explanation:

A force is an interaction between two or more objects. It requires an interaction to exist. Differing masses are not necessary for a force to be present (e.g., two equal - mass objects can interact). One very large object alone cannot create a force without interaction. Objects far apart may not interact and thus no force exists between them.

Answer:

two objects interacting