This is a great question that gets to the heart of Newton's Third Law of Motion! It's true that forces always come in pairs, but that doesn't mean nothing can ever move. Here's why:

The key is to understand that forces act on different objects.

* Force pairs act on different objects: When you push a box, you exert a force on the box, and the box exerts an equal and opposite force on you. The forces are equal and opposite, but they act on different objects (you and the box).

* Motion arises from the net force on a single object: To understand motion, you need to consider the *net force* acting on a single object. If the net force on the box is not zero (meaning the force you exert is greater than any opposing forces like friction), the box will accelerate.

Let's break it down with an example:

1. You push a box: You exert a force on the box, causing it to move.

2. The box pushes back on you: The box simultaneously exerts an equal and opposite force on you, which you can feel.

3. Net force on the box: The force you exert on the box is greater than the force of friction between the box and the floor. This creates a *net force* on the box, causing it to accelerate.

4. Net force on you: The force the box exerts on you is equal and opposite to the force you exert on it. This force might cause you to move backwards slightly.

In summary:

* Forces always come in equal and opposite pairs.

* These pairs act on *different* objects.

* Motion is determined by the *net force* acting on a single object.

Let me know if you have any more questions!