Question

which statement explains how gravity and inertia work together?
○ they change the motion of objects.
○ they take turns working on objects.
○ they keep all objects moving at the same speed.
○ they prevent objects from moving in a circular motion.

Explanation:

Inertia is the tendency of objects to resist changes in motion, while gravity is a force that pulls objects toward each other. Together, gravity acts to change an object's motion (e.g., pulling it toward a massive body), and inertia resists that change, resulting in the observed motion of objects (like orbits, where gravity provides centripetal force and inertia keeps the object moving tangentially). The other options are incorrect: gravity and inertia act simultaneously, not in turns; they do not keep all objects at the same speed; and they enable circular motion (like planetary orbits) rather than preventing it.

Answer:

A. They change the motion of objects.