What is First Law (Law of Inertia)?

The first law says that things keep moving (or stay still) unless something else pushes or pulls them.

Imagine you're on a swing. When you’re swinging, you keep going back and forth, even when no one is pushing you anymore. But if the swing stops, it’s because something like friction (like air or the chain rubbing) slows you down. That's the law of inertia in action!

Inertia is like your personal laziness, you don’t want to stop moving unless forced to. If you're sitting on a couch and someone suddenly moves the couch, you might slide or even fall off, because your body wants to keep doing what it was doing (staying still).

Think about riding in a car. When the car stops suddenly, you feel like you’re being pushed forward. That’s because your body wanted to keep moving at the same speed as the car, but the car stopped first!

So, the first law of motion is all about how things behave when nothing else is touching them, just like how you keep swinging or slide off a couch if it moves suddenly!