The first law of motion is also called the law of:

**The reasoning** Newton's First Law states: "A body at rest stays at rest, and a body in motion continues in uniform motion in a straight line, *unless* acted upon by an external force." The key concept here is **inertia** — the natural tendency of objects to resist changes in their state of motion. A ball won't roll by itself (resists starting), and a moving car wants to keep moving when you brake (resists stopping). This "stubbornness" to change is inertia, and it's directly related to the object's mass. That's why Newton's First Law is called the **Law of Inertia**. **Why the wrong options tempt you** - **Energy** relates to the capacity to do work (that's a different concept entirely) - **Gravity** is a force that pulls objects together (Newton's Law of Universal Gravitation) - **Friction** is a force that opposes motion, but it's not what the First Law describes fundamentally These are all physics terms you're studying, so they sound plausible! But they describe *different* principles. **Quick takeaway** Remember: "First Law = Inertia" — objects resist change unless you push or pull them!