Arizona State University (ASU) PHY101 Introduction to Physics Practice Exam

Inertia is a property of matter that is directly related to an object's mass. It is the resistance of an object to changes in its state of motion, which means that an object with greater mass will have greater inertia, making it harder to accelerate. On the Moon, objects weigh less due to the lower gravitational pull, but their mass remains unchanged. Since inertia is a function of mass, an object's inertia does not decrease simply because it is on the Moon; it remains constant regardless of the gravitational environment surrounding it.

The other choices incorrectly associate inertia with weight or movement characteristics rather than focusing on the fundamental principle of mass. Inertia is fundamentally about mass, making it independent of the object's weight, which is specifically influenced by gravitational force. Thus, the correct assertion is that inertia depends solely on mass, not on the varying weight experienced in different gravitational fields.