The best description of a force that acts between two objects is: An interaction that can cause a change in the motion or shape of an object.

Here's why:

* Interaction: Forces always involve a relationship between two or more objects. They are not something an object possesses on its own.

* Change in motion: Forces can accelerate or decelerate an object, changing its velocity (speed and direction).

* Change in shape: Forces can also deform an object, changing its shape (like stretching a rubber band).

Some examples of forces acting between objects include:

* Gravity: The force of attraction between any two objects with mass.

* Electromagnetism: The force between electrically charged objects.

* Contact forces: Forces that occur when objects touch, like friction or the force of a push or pull.

Let me know if you'd like a more detailed explanation of a specific type of force!