Fundamental force

Imagine that you are playing with different types of toys. Some toys are easy to move around, like a ball that you can roll on the floor. Other toys are harder to move, like a heavy box that you can't move by yourself.

Now imagine that everything in the world is made up of tiny things called particles. There are even smaller things inside these particles, called subatomic particles.

Fundamental forces are like invisible hands that push or pull on these particles. They are the rules that determine how these tiny things interact with each other. Just like how some toys are easier or harder to move, particles experience different forces that make them move in different ways.

There are four fundamental forces that you should know about:

1. Gravity - This is the force that pulls everything towards everything else. For example, this is why you stick to the ground, and why the moon orbits around the Earth.

2. Electromagnetic force - This force makes things that have an electric charge, like magnets or your phone charger, stick or repel each other.

3. Strong nuclear force - This is the force that holds the nucleus of an atom together, even though it's made up of positive protons that should be repelling each other.

4. Weak nuclear force - This force is involved in nuclear reactions, like the ones that power the Sun, and makes particles transform from one type to another.

Although we can't see these forces, scientists have found ways to study and measure them so that we can understand how the universe works. The fundamental forces are like the rules of a game, and by understanding them, we can learn how everything from tiny particles to entire galaxies move and interact.