Inertia is the tendency of an object to resist changes in its motion. It's a property of mass, not a force. Here's how inertia relates to force:

* Inertia and Force are Different: Inertia is the *resistance* to changes in motion, while force is the *cause* of changes in motion.

* Newton's Second Law: The relationship between force, mass, and acceleration is described by Newton's Second Law: Force = Mass x Acceleration.

So, what happens if you double the force?

* Acceleration Doubles: If you double the force acting on an object, you double its acceleration.

* Inertia Remains Constant: Inertia, determined by the object's mass, remains unchanged.

Example:

Imagine pushing a heavy box. It takes a lot of force to get it moving because of its high inertia (due to its mass). If you double the force you apply, you'll double the box's acceleration, making it move much faster. However, the box's inertia itself won't change.

In summary: Doubling the force doesn't affect inertia; it increases the acceleration of the object.