Question

____is a measure of inertia, or a measure of a bodys resistance to change in motion.

answer input:
spelling counts but capitalization doesnt.

Explanation:

In physics (a subfield of Natural Science), mass is defined as the measure of inertia, representing a body's resistance to changes in its state of motion (like acceleration or deceleration). This is a fundamental concept in Newton's laws of motion, where mass relates to how much force is needed to change an object's motion.

Answer:

mass