What is Inertia?

Inertia is the resistance of an object to changes in its state of motion. According to Newton's first law of motion, 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. In simpler terms, an object will not move or change its motion unless something such as a force or friction acts upon it. This concept is crucial in understanding the behavior of objects in the context of forces and motion in physics.

Understanding inertia is foundational to understanding the physics of forces and motion.