Physics
Newton's First Law of Motion
Quick fact
A car seatbelt is an application of Newton's first law, preventing passengers from continuing forward during sudden stops.
Why this is interesting
Have you ever noticed that a book on a table stays still unless you push it? That’s because of inertia—the natural resistance of objects to change their state of motion.
Read the full explanation
Understanding Newton's First Law of Motion
Newton’s first law says that if no forces act on an object, it will either stay still or keep moving at a constant speed. This resistance to change in motion is called inertia. Think of a ball rolling on smooth ground—it keeps going until friction or another force slows it down.
A deeper explanation
Inertia is the tendency of an object to resist changes in its velocity. The law highlights that forces are only needed to start, stop, or alter the direction of motion. This principle explains why objects maintain their state unless influenced by external forces and underpins how we understand motion in everyday life.