Question

what is inertia?
a. the force that causes movement
b. the speed of an object
c. the resistance to changes in motion

Explanation:

Inertia is a fundamental concept in physics. It refers to an object's tendency to resist changes in its state of motion. This means that an object at rest will stay at rest, and an object in motion will stay in motion (with the same speed and direction) unless acted upon by an external force.

• Option a: A force that causes movement is not inertia. Forces like a push or pull (e.g., applied force) cause movement. Inertia is not a force.
• Option b: The speed of an object is a measure of how fast it is moving. Inertia is not related to the speed value itself but to the object's resistance to changes in its motion (which could involve changes in speed).
• Option c: This correctly describes inertia as the resistance to changes in motion.

Answer:

C. The resistance to changes in motion