1. Gravitational Force: This is a force of attraction between two objects that is proportional to the product of their masses and inversely proportional to the square of the distance between them. It is the force that keeps us on the ground and keeps the planets in orbit.
2. Electromagnetic Force: This is the force that acts between electrically charged particles and is responsible for the emission and absorption of energy in the form of electromagnetic radiation.
3. Strong Nuclear Force: This is a short-range force that binds together protons and neutrons in the nucleus of an atom. It is one of the four fundamental forces of nature.
4. Weak Nuclear Force: This is a short-range force that is responsible for certain types of radioactive decay. It is one of the four fundamental forces of nature.
5. Frictional Force: This is the force that opposes the relative motion of two objects in contact. It is caused by the interaction of the molecules of the two objects.
6. Centripetal Force: This is a force that acts on objects in circular motion and is directed toward the center of the circle. It is responsible for keeping the object in motion.