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Science · Grades 3–4

Inertia

noun

The tendency of an object to resist a change in its state of rest or motion.

Example Sentences

"Inertia keeps a rolling ball rolling until friction slows it down."

"You feel inertia pushing you forward when a car suddenly brakes."

Synonyms & Related Terms

resistance to change

Quick Check

Which best describes the meaning of inertia?

Study Tips

To remember inertia, try writing it in a sentence of your own. Connect it to something you already know about science.

Use it in conversation today — saying a word aloud three times helps lock it into long-term memory.