What does increasing the mass of an object do to its inertia according to Newton's second law?

Increasing the mass of an object directly increases its inertia. Inertia is defined as the resistance of an object to changes in its state of motion, which means that heavier objects, or those with greater mass, inherently resist changes in motion more than lighter objects. This relationship is described by Newton's second law, which states that the acceleration of an object is inversely proportional to its mass when the same force is applied; in other words, a larger mass will result in less acceleration for the same input of force. Therefore, when the mass is increased, the amount of force required to change the object's motion increases, demonstrating a greater inertia. This understanding underscores why heavier objects are more difficult to start moving or to stop once they are in motion.