Final answer:
Inertia is the property of matter to resist changes in motion, and mass is the measure of this inertia. Objects with more mass have more inertia, making it more difficult to change their motion.
Step-by-step explanation:
Inertia and mass are related concepts. Inertia is the property of matter to resist changes in motion, while mass is the measure of this inertia. Objects with more mass have more inertia, meaning it is more difficult to change their motion. Mass is a measure of the amount of matter in an object and is typically expressed in kilograms.