* Gravitational force: This is the force of attraction between any two objects with mass. It acts over vast distances, keeping the planets in orbit around the sun.
* Electromagnetic force: This force involves the interaction of electrically charged particles. It can be attractive or repulsive, and it's responsible for things like magnetism, electricity, and light.
* Nuclear force: This force acts within the nucleus of an atom, holding protons and neutrons together. While it's extremely strong, it acts over a very short distance.
In contrast to non-contact forces, contact forces require physical contact between objects, like friction or the force of a push or pull.
