Law of Inertia

The law of inertia, also known as Newton's first law of motion, states that an object at rest will remain at rest, and an object in motion will remain in motion at a constant velocity, unless acted upon by an external force. In other words, an object will continue to do what it's doing unless something makes it stop or change direction.

Study Guide

Here are some key points to remember about the law of inertia:

1. An object at rest stays at rest, and an object in motion stays in motion unless acted upon by an external force.
2. The tendency of an object to resist changes in its motion is called inertia.
3. The greater the mass of an object, the greater its inertia.
4. Inertia is a property of matter and is related to mass.
5. The law of inertia is one of the fundamental principles of physics, as formulated by Sir Isaac Newton.

When studying the law of inertia, it's important to understand the concept of inertia, the relationship between mass and inertia, and how inertia relates to the motion of objects.