What is First Law?

The First Law is like a rule that helps us understand how things move and stay still, it's all about what happens when something pushes or pulls on another thing.

Imagine you're playing with your favorite toy car on the floor. If you give it a little push, it starts rolling. But if there’s nothing stopping it, it just keeps going until it hits a wall or you take your hand away. That's because of the First Law: if something is moving and nothing pushes or pulls on it, it will keep moving in the same way.

Now think about when you’re sitting on a swing. If you stop pushing, you’ll keep swinging back and forth for a while, but eventually, you'll slow down and stop. That’s because there are tiny forces (like air and friction) that act like invisible hands trying to stop your swing.

• If something is moving and nothing stops it, it keeps going in a straight line at the same speed.
• If something is not moving and nothing pushes it, it stays still, just like when you're sitting on the floor waiting for your toy car to come back.