the tendency of an object to resist changes in motion

Answer 1

The tendency of an object to resist changes in its motion is referred to as inertia. Inertia is a fundamental property of matter, and according to Newton's first law of motion, an object at rest will remain at rest, and an object in motion will continue in motion with the same speed and in the same direction unless acted upon by an external force. The amount of inertia an object has is directly related to its mass: the more massive an object is, the greater its inertia and the more force it will take to change its motion.