You're absolutely right! If the force you exert on a door is exactly equal to the force resisting its opening, the door won't move. This is a perfect example of Newton's First Law of Motion, which states:

* An object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

Here's why this applies to the door:

* Balanced Forces: When you push or pull on a door, you're applying a force. The door itself has its own resistance to movement, which we can think of as a force acting in the opposite direction. If these forces are equal and opposite, they cancel each other out.

* Net Force: The "net force" is the overall force acting on an object. When forces are balanced, the net force is zero.

* No Acceleration: Since the net force is zero, the door doesn't accelerate (change its speed or direction). If it was already at rest, it will stay at rest.

To make the door move, you need to:

* Increase your force: Exert a force greater than the resistance of the door. This creates an unbalanced force, resulting in a net force that causes the door to open.

* Reduce the resistance: If the door is stuck, you might need to lubricate the hinges or remove any obstacles blocking its path.