1. Gravitational Force: This force acts between any two objects with mass. It is always attractive, and its strength depends on the masses of the objects and the distance between them.
2. Electromagnetic Force: This force acts between electrically charged objects. It can be attractive or repulsive depending on the charges of the objects. It is responsible for many phenomena like electricity, magnetism, light, and chemical bonds.
3. Strong Nuclear Force: This force binds protons and neutrons together within the nucleus of an atom. It is the strongest of the four fundamental forces, but it acts only over very short distances.
4. Weak Nuclear Force: This force is responsible for radioactive decay and certain types of nuclear reactions. It is weaker than the strong nuclear force but stronger than gravity.
These four forces are considered "fundamental" because they cannot be explained in terms of other forces. They are the building blocks of the universe and govern all interactions between matter and energy.
