Fundamental Force

Fundamental forces (also referred as field forces)are forces that result from the fundamental interactions in nature. They do not require contact. The four fundamental interactions are

• Gravitational interaction
• Electromagnetic interaction
• Weak interaction (affects quarks and leptons)
• Strong interaction
  • fundamental interaction between quarks and gluons
  • residual interaction between hadrons, such as protons and neutrons

Non-fundamental forces depend on one or more of the fundamental forces. For example, the normal force exerted by a surface is a result of electromagnetic repulsive forces at the atomic level. Friction, elastic, tension, and normal forces (along with others) are all non-fundamental.